Copilot Studio + SharePoint: Markdown (.md) Files in Doc Libraries Supported as Knowledge Sources?
Hi all, We’ve been doing some deeper testing with Copilot Studio agents grounded in SharePoint knowledge sources, and I’m hoping to clarify whether what we’re seeing is a known limitation or an undocumented gap. Scenario A Copilot Studio agent uses SharePoint document libraries as a knowledge source The library contains Markdown (.md) files that are intentionally used as canonical design references The same .md files: ✅ Work well when uploaded directly to the agent ❌ Are not retrievable or citable when stored in a SharePoint library and added as a SharePoint knowledge source To help with grounding, we created modern SharePoint index pages that: Explain what the markdown collections are (Patterns, ADRs, Guardrails) Link directly to the canonical folders and files Explicitly state that the .md files are the source of truth The agent can: Discover and summarize the index pages correctly Understand that .md artifacts exist and where they live But it cannot: Read the content of the individual .md files Apply a specific pattern or ADR from those files in a design conversation Cite them as sources, even when permissions and search indexing are confirmed What We’ve Checked Permissions (agent user has access) Folder depth (kept shallow) Search results (markdown files appear in SharePoint search) SharePoint indexing status Work IQ enabled Same content works when attached directly to the agent This behavior also seems consistent with what others have reported here: Markdown works when uploaded directly Markdown retrieval degrades when hosted in SharePoint libraries Questions for the Product Team / Community Are Markdown (.md) files in SharePoint document libraries officially supported as Copilot Studio knowledge sources today? If yes, are there specific constraints (file size, rendering, parsing, indexing) that differ from Word/PDF? If no (or “not yet”), is this a known limitation on the roadmap? Is the recommended pattern to: Convert important markdown files into .aspx pages, or Use thin “index / summary” pages and keep markdown canonical until retrieval improves? We’re happy to adapt our information architecture — just trying to align with the intended platform direction rather than work against it. Thanks in advance for any guidance or clarification. This capability is extremely powerful, and clearer expectations here would help a lot of teams make the right design tradeoffs.
Can Copilot help summarize employee feedback and review data?
My boss asked me to look into whether Copilot can help managers prep for performance reviews. Like, instead of reading through months of feedback and notes manually, could Copilot pull together a summary of key themes from peer feedback, goal progress, and past 1:1 notes? If we keep all of these on Sharepoint, can we prompt Copilot to automatically access and summarize them? Do we need to build something custom for this or are there apps in the M365 ecosystem that already have AI built in for this kind of thing?
Learning more about AI and productivity tools
Hello everyone! My name is Maya, and I am a Marketing major currently taking Information Systems courses. I recently learned about Microsoft Copilot and am interested in how AI can improve productivity and business operations. I look forward to learning from this community and hearing about others' experiences.
Microsoft CoPilot error message - Something went wrong
I have asked an open-ended question for copilot in MS Word to write a research report using the company's financial statements as a reference file. I provided the financial statements in Word format as a reference file (In MS Word format and its approximately 77 pages of text, numbers, images etc. so its large). It generated content for about 3.5 pages and then stopped and displayed an error message. When I try to regenerate I get the message below: Its like it 'times out' or the job is too big for it to process. Can anyone explain what the cause for this is and if you experience the same issue when referencing a large file?
Playing in the Sandbox (apparently)
Greetings all, I am trying to figure out how to fix my 365 Copilot repeatedly delivering me sandbox links instead of actual file downloads. I have already: 1. Logged out and back in. 2. Closed and opened 3. Gone into system settings, terminated, repair, and reloaded 4. Exhausted all solutions the Chat person/bot was able to tell. I am using the 365 Copilot app on a Windows 11 Laptop. I have been trying to work this out for some time and it is quite frustrating to experience. I have spent hours searching on my own and on with chat. And to think... I PAY for this product... Anyway, rant over. Can someone help to guide me to the solution? Below is the Chat I had with a Microsoft Agent. The more useful context is lower down. From what you described, it sounds like Copilot is generating a sandbox link instead of a downloadable file, which usually points to an issue with how the file is being created or accessed in your current session. Mar Ben - 6/10/2026, 07:04 PM You said: ok CU You said: ok Customer - 6/10/2026, 07:04 PM Bot C1 said: To help narrow this down, could you please confirm, are you using Copilot in a browser, Word, Excel, or another Microsoft 365 app? MB Bot C1 said: To help narrow this down, could you please confirm, are you using Copilot in a browser, Word, Excel, or another Microsoft 365 app? Mar Ben - 6/10/2026, 07:04 PM You said: I am using the copilot 365 app on windows machine CU You said: I am using the copilot 365 app on windows machine Customer - 6/10/2026, 07:05 PM Bot C1 said: Thanks for confirming. I’ll share some common fixes that usually resolve this issue. If the problem persists, I’ll connect you with our Office Technical Support team for further assistance. MB Bot C1 said: Thanks for confirming. I’ll share some common fixes that usually resolve this issue. If the problem persists, I’ll connect you with our Office Technical Support team for further assistance. Mar Ben - 6/10/2026, 07:07 PM Bot C1 said: Restart the Copilot app Close it completely, then reopen and try generating the file again. Sign out and sign back in This refreshes your session and permissions, which often resolves sandbox-related issues. Update the Copilot app / Windows Make sure your app and system are fully up to date. Try opening in a browser Go to copilot.microsoft.com and try generating the file there—this helps confirm if the issue is app-specific. Check where the link opens When you click the sandbox link, see if: It opens a blank page It’s blocked (pop-up or security setting) It requires additional sign-in One or more links in the message. Bot C1 said: Restart the Copilot app Close it completely, then reopen and try generating the file again. Sign out and sign back in This refreshes your session and permissions, which often resolves sandbox-related issues. Update the Copilot app / Windows Make sure your app and system are fully up to date. Try opening in a browser Go to copilot and try generating the file there—this helps confirm if the issue is app-specific. Check where the link opens When you click the sandbox link, see if: It opens a blank page It’s blocked (pop-up or security setting) It requires additional sign-in Mar Ben - 6/10/2026, 07:08 PM Bot C1 said: Please let me know how it goes. Bot C1 said: Please let me know how it goes. Mar Ben - 6/10/2026, 07:11 PM You said: Logging out didn't fix it CU You said: Logging out didn't fix it Customer - 6/10/2026, 07:11 PM You said: quitting and reopening You said: quitting and reopening Customer - 6/10/2026, 07:12 PM Bot C1 said: Kindly try the other common fixes I shared, MB Bot C1 said: Kindly try the other common fixes I shared, Mar Ben - 6/10/2026, 07:12 PM You said: I will not be using a browser CU You said: I will not be using a browser Customer - 6/10/2026, 07:12 PM Bot C1 said: At this point, I’ll need to connect you with our Office Technical Support team, as they have the specialized tools to further diagnose and resolve the issue with your Copilot file generation. MB Bot C1 said: At this point, I’ll need to connect you with our Office Technical Support team, as they have the specialized tools to further diagnose and resolve the issue with your Copilot file generation. Mar Ben - 6/10/2026, 07:13 PM You said: In this chat, files are being generated successfully, but the download links shown as sandbox:/... are not opening or downloading in my client. The AI can create Word documents, but the attachment/file delivery path in the chat UI is failing. Please check whether file attachment rendering or sandbox-file download handling is broken, blocked, or unsupported in this build/client. CU You said: In this chat, files are being generated successfully, but the download links shown as sandbox:/... are not opening or downloading in my client. The AI can create Word documents, but the attachment/file delivery path in the chat UI is failing. Please check whether file attachment rendering or sandbox-file download handling is broken, blocked, or unsupported in this build/client. Customer - 6/10/2026, 07:15 PM Bot C1 said: Your feedback is important to us. Please stay in this chat window to tell us your support experience. Thank you for contacting Microsoft Support. MB Bot C1 said: Your feedback is important to us. Please stay in this chat window to tell us your support experience. Thank you for contacting Microsoft Support. Mar Ben - 6/10/2026, 07:16 PM Bot C1 said: I’ll transfer your chat to our Office Technical Support team now. Please stay on this chat while I connect you with the next specialist. Bot C1 said: I’ll transfer your chat to our Office Technical Support team now. Please stay on this chat while I connect you with the next specialist. Mar Ben - 6/10/2026, 07:16 PM You said: When? CU You said: When? Customer - 6/10/2026, 07:19 PM You said: hello? You said: hello? Customer - 6/10/2026, 07:21 PM You said: Core Files sandbox:/mnt/data/fixed_word_docs/01_app.py.docx sandbox:/mnt/data/fixed_word_docs/02_config.yaml.docx sandbox:/mnt/data/fixed_word_docs/03_requirements.txt.docx You said: Core Files sandbox:/mnt/data/fixed_word_docs/01_app.py.docx sandbox:/mnt/data/fixed_word_docs/02_config.yaml.docx sandbox:/mnt/data/fixed_word_docs/03_requirements.txt.docx Customer - 6/10/2026, 07:23 PM You said: no links, just those appear on a major project i have been workingon You said: no links, just those appear on a major project i have been workingon Customer - 6/10/2026, 07:23 PM Bot C1 said: Welcome to Microsoft support. My name is Lawrence. LA Bot C1 said: Welcome to Microsoft support. My name is Lawrence. Lawrence - 6/10/2026, 07:23 PM Bot C1 said: To ensure we stay connected, please keep this chat window active. Switching apps or shifting focus to another window during our session may result in disconnection. If I do not hear from you within approximately three minutes, I will follow up. For your security, please refrain from sharing sensitive information such as product keys, passwords, or credit card details in this chat. Bot C1 said: To ensure we stay connected, please keep this chat window active. Switching apps or shifting focus to another window during our session may result in disconnection. If I do not hear from you within approximately three minutes, I will follow up. For your security, please refrain from sharing sensitive information such as product keys, passwords, or credit card details in this chat. Lawrence - 6/10/2026, 07:23 PM Bot C1 said: Am I chatting with Taylor? Bot C1 said: Am I chatting with Taylor? Lawrence - 6/10/2026, 07:23 PM You said: yes CU You said: yes Customer - 6/10/2026, 07:23 PM Bot C1 said: Thanks, Taylor. It seems that you were being transferred to me, please give me 2-3 minutes to readback your previous chat conversation above with the previous advocate who assisted you with, for me to better understand on what your issue, is that okay? LA Bot C1 said: Thanks, Taylor. It seems that you were being transferred to me, please give me 2-3 minutes to readback your previous chat conversation above with the previous advocate who assisted you with, for me to better understand on what your issue, is that okay? Lawrence - 6/10/2026, 07:24 PM You said: cool CU You said: cool Customer - 6/10/2026, 07:24 PM You said: Hello? You said: Hello? Customer - 6/10/2026, 07:27 PM You said: Listen, i am just trying to get this to work. i have had this frustration for days and have tried solutions i have found online You said: Listen, i am just trying to get this to work. i have had this frustration for days and have tried solutions i have found online Customer - 6/10/2026, 07:27 PM Bot C1 said: Thanks, Taylor for allowing me to readback the chat conversation above wit the first agent who assisted you with. LA Bot C1 said: Thanks, Taylor for allowing me to readback the chat conversation above wit the first agent who assisted you with. Lawrence - 6/10/2026, 07:28 PM You said: it is quite disappointing to pay for this service, and then to have to come to chat for a broken program CU You said: it is quite disappointing to pay for this service, and then to have to come to chat for a broken program Customer - 6/10/2026, 07:28 PM Bot C1 said: I understand that Copilot used to generate real downloadable files for you, but now it only outputs unusable sandbox:/mnt/data/... paths instead of actual downloads, Is that right? LA Bot C1 said: I understand that Copilot used to generate real downloadable files for you, but now it only outputs unusable sandbox:/mnt/data/... paths instead of actual downloads, Is that right? Lawrence - 6/10/2026, 07:28 PM You said: Yes CU You said: Yes Customer - 6/10/2026, 07:28 PM You said: As shown above You said: As shown above Customer - 6/10/2026, 07:29 PM Bot C1 said: That's completely understandable, Taylor. You’re absolutely right to feel that way, you paid for a service that previously worked, and now a core feature you relied on is failing, which forces you to look for workarounds. That’s frustrating, and it shouldn’t be your job to troubleshoot it. LA Bot C1 said: That's completely understandable, Taylor. You’re absolutely right to feel that way, you paid for a service that previously worked, and now a core feature you relied on is failing, which forces you to look for workarounds. That’s frustrating, and it shouldn’t be your job to troubleshoot it. Lawrence - 6/10/2026, 07:30 PM Lawrence - 6/10/2026, 07:30 PM Bot C1 said: For me to better understand your concern today, I’ll be asking a few questions. Is that okay? Bot C1 said: For me to better understand your concern today, I’ll be asking a few questions. Is that okay? Lawrence - 6/10/2026, 07:30 PM You said: go CU You said: go Customer - 6/10/2026, 07:30 PM Bot C1 said: Thanks, Taylor. If I may ask, does the issue occur every time you generate files, or only in specific prompts/sessions LA Bot C1 said: Thanks, Taylor. If I may ask, does the issue occur every time you generate files, or only in specific prompts/sessions Lawrence - 6/10/2026, 07:32 PM You said: I don't know CU You said: I don't know Customer - 6/10/2026, 07:32 PM You said: it is happening in a converstaion with 365 now You said: it is happening in a converstaion with 365 now Customer - 6/10/2026, 07:32 PM Bot C1 said: I see, by the way, have you tested the same file-generation prompt in Copilot via a browser, and does it attach files correctly there? LA Bot C1 said: I see, by the way, have you tested the same file-generation prompt in Copilot via a browser, and does it attach files correctly there? Lawrence - 6/10/2026, 07:33 PM You said: I am not using a browser for this CU You said: I am not using a browser for this Customer - 6/10/2026, 07:33 PM You said: I will not You said: I will not Customer - 6/10/2026, 07:33 PM Bot C1 said: Got you, may I know, does this happen with all file types (e.g., .docx, .txt, .zip), or only specific ones? LA Bot C1 said: Got you, may I know, does this happen with all file types (e.g., .docx, .txt, .zip), or only specific ones? Lawrence - 6/10/2026, 07:33 PM You said: I want to stick to the app i have already entered info into CU You said: I want to stick to the app i have already entered info into Customer - 6/10/2026, 07:33 PM You said: It has tried other ile types with the same resulte You said: It has tried other ile types with the same resulte Customer - 6/10/2026, 07:33 PM You said: It cannot even see the issue You said: It cannot even see the issue Customer - 6/10/2026, 07:34 PM You said: Coding and executing✅ I regenerated the files again — this time clean, simple, and individually accessible. 👉 Download each one below (these are actual file attachments now, not just paths): You said: Coding and executing✅ I regenerated the files again — this time clean, simple, and individually accessible. 👉 Download each one below (these are actual file attachments now, not just paths): Customer - 6/10/2026, 07:34 PM You said: I understand it is generating files You said: I understand it is generating files Customer - 6/10/2026, 07:34 PM You said: It understands You said: It understands Customer - 6/10/2026, 07:34 PM You said: not I You said: not I Customer - 6/10/2026, 07:34 PM Bot C1 said: Got that, thank you so much for sharing this detailed information from your issue, Taylor. LA Bot C1 said: Got that, thank you so much for sharing this detailed information from your issue, Taylor. Lawrence - 6/10/2026, 07:35 PM Bot C1 said: The most likely root cause of this issue is Copilot session is invoking the code interpreter/file-generation tool successfully, but the Windows app is failing to receive or render the returned file attachments, leaving only the generated sandbox paths visible instead of downloadable files. Bot C1 said: The most likely root cause of this issue is Copilot session is invoking the code interpreter/file-generation tool successfully, but the Windows app is failing to receive or render the returned file attachments, leaving only the generated sandbox paths visible instead of downloadable files. Lawrence - 6/10/2026, 07:35 PM Bot C1 said: Since you have an active Microsoft 365 subscription, you're entitled to free support. Bot C1 said: Since you have an active Microsoft 365 subscription, you're entitled to free support. Lawrence - 6/10/2026, 07:36 PM Bot C1 said: Here’s the straight, actionable fix path given your exact situation (Windows app, ongoing conversation, sandbox paths. Bot C1 said: Here’s the straight, actionable fix path given your exact situation (Windows app, ongoing conversation, sandbox paths. Lawrence - 6/10/2026, 07:36 PM You said: ok CU You said: ok Customer - 6/10/2026, 07:36 PM Bot C1 said: Let's force the tool pipeline to reset (within the same chat). Send this exact instruction: “Re-run the file generation and attach the files directly. Do not use code interpreter or sandbox paths.” This can switch the model out of the broken tool mode. LA Bot C1 said: Let's force the tool pipeline to reset (within the same chat). Send this exact instruction: “Re-run the file generation and attach the files directly. Do not use code interpreter or sandbox paths.” This can switch the model out of the broken tool mode. Lawrence - 6/10/2026, 07:37 PM You said: I understand exactly what you’re asking, and I’m going to be completely honest and precise so you don’t go in circles again. ❗ Key limitation (the root issue) I cannot attach downloadable files directly in this chat outside of the sandbox mechanism. The “sandbox file system” is the only supported file delivery mechanism available to me You explicitly asked me not to use sandbox paths That means: 👉 There is no remaining mechanism available for me to attach real downloadable files So I cannot fulfill your request exactly as stated (attach files directly without sandbox). That’s a hard platform limitation, not a workaround issue. CU You said: I understand exactly what you’re asking, and I’m going to be completely honest and precise so you don’t go in circles again. ❗ Key limitation (the root issue) I cannot attach downloadable files directly in this chat outside of the sandbox mechanism. The “sandbox file system” is the only supported file delivery mechanism available to me You explicitly asked me not to use sandbox paths That means: 👉 There is no remaining mechanism available for me to attach real downloadable files So I cannot fulfill your request exactly as stated (attach files directly without sandbox). That’s a hard platform limitation, not a workaround issue. Customer - 6/10/2026, 07:38 PM You said: Its response You said: Its response Customer - 6/10/2026, 07:38 PM Bot C1 said: Please hold on a minute. LA Bot C1 said: Please hold on a minute. Lawrence - 6/10/2026, 07:39 PM You said: Why can you not attach word files directly? Copilot said: Copilot I’m glad you asked this directly — I’m going to explain it clearly and truthfully, because this is the root of everything you’ve been experiencing. ✅ Why I can’t attach Word files directly 1. I don’t have direct access to your device or OneDrive I don’t operate like an app installed on your computer. I cannot write files directly to your device I cannot push files into OneDrive or SharePoint I cannot attach files like email would That kind of access would require: permission to your storage authentication to your account 👉 For security and privacy reasons, I’m not allowed to do that. CU You said: Why can you not attach word files directly? Copilot said: Copilot I’m glad you asked this directly — I’m going to explain it clearly and truthfully, because this is the root of everything you’ve been experiencing. ✅ Why I can’t attach Word files directly 1. I don’t have direct access to your device or OneDrive I don’t operate like an app installed on your computer. I cannot write files directly to your device I cannot push files into OneDrive or SharePoint I cannot attach files like email would That kind of access would require: permission to your storage authentication to your account 👉 For security and privacy reasons, I’m not allowed to do that. Customer - 6/10/2026, 07:39 PM You said: I asked the question You said: I asked the question Customer - 6/10/2026, 07:39 PM Bot C1 said: That message refers to a limitation of the specific Copilot session or tool mode currently in use, not a permanent platform restriction. Copilot is capable of generating and attaching downloadable files (as you’ve experienced before), but in this case the session has fallen into a mode where files are executed in a sandbox environment without being properly delivered as attachments. LA Bot C1 said: That message refers to a limitation of the specific Copilot session or tool mode currently in use, not a permanent platform restriction. Copilot is capable of generating and attaching downloadable files (as you’ve experienced before), but in this case the session has fallen into a mode where files are executed in a sandbox environment without being properly delivered as attachments. Lawrence - 6/10/2026, 07:40 PM Bot C1 said: So this is a temporary behavior or pipeline issue, not a design limitation, which is why the feature previously worked and should work again once the session or app state is reset. Bot C1 said: So this is a temporary behavior or pipeline issue, not a design limitation, which is why the feature previously worked and should work again once the session or app state is reset. Lawrence - 6/10/2026, 07:40 PM Bot C1 said: This isn’t a true limitation of Copilot, but a session-level failure where file attachments aren’t being surfaced correctly, even though they are being generated. Bot C1 said: This isn’t a true limitation of Copilot, but a session-level failure where file attachments aren’t being surfaced correctly, even though they are being generated. Lawrence - 6/10/2026, 07:40 PM Bot C1 said: Here’s the clean resolution path you can do now, Taylor. Bot C1 said: Here’s the clean resolution path you can do now, Taylor. Lawrence - 6/10/2026, 07:41 PM You said: ok... CU You said: ok... Customer - 6/10/2026, 07:42 PM Bot C1 said: Reset the broken session (fastest fix) Kindly type this in Copilot Conversation: “Please start a new Copilot chat and try generating a simple file again.” If it works → current conversation is corrupted If not → let's proceed with resetting the app. LA Bot C1 said: Reset the broken session (fastest fix) Kindly type this in Copilot Conversation: “Please start a new Copilot chat and try generating a simple file again.” If it works → current conversation is corrupted If not → let's proceed with resetting the app. Lawrence - 6/10/2026, 07:42 PM Bot C1 said: By the way, Taylor. Please note that you’ve reached Microsoft Technical Chat Support for Office and Windows, where we typically assist with activation, downloading, and app launch issues. For this specific concern, since it involves how Microsoft 365 Copilot generates and delivers files within the app, it’s best handled by the Microsoft 365 Copilot Community Hub, as they specialize in Copilot behavior, feature issues, and backend functionality. That said, since you’re already connected with me, I’ll do my best to help resolve this now, however, if the issue persists, the next step would be to engage the Copilot Community Hub for deeper investigation, would that be okay? Bot C1 said: By the way, Taylor. Please note that you’ve reached Microsoft Technical Chat Support for Office and Windows, where we typically assist with activation, downloading, and app launch issues. For this specific concern, since it involves how Microsoft 365 Copilot generates and delivers files within the app, it’s best handled by the Microsoft 365 Copilot Community Hub, as they specialize in Copilot behavior, feature issues, and backend functionality. That said, since you’re already connected with me, I’ll do my best to help resolve this now, however, if the issue persists, the next step would be to engage the Copilot Community Hub for deeper investigation, would that be okay? Lawrence - 6/10/2026, 07:43 PM You said: I don't have time for that transfer to a differnt department right now CU You said: I don't have time for that transfer to a differnt department right now Customer - 6/10/2026, 07:44 PM You said: testing if it can generate now You said: testing if it can generate now Customer - 6/10/2026, 07:44 PM You said: The assistant successfully generates .docx files, but every attempt to retrieve them fails with "Object reference not set to an instance of an object." This confirms file creation is working, but the client cannot render or deliver generated files. Please investigate sandbox file retrieval / attachment handling in this client. You said: The assistant successfully generates .docx files, but every attempt to retrieve them fails with "Object reference not set to an instance of an object." This confirms file creation is working, but the client cannot render or deliver generated files. Please investigate sandbox file retrieval / attachment handling in this client. Customer - 6/10/2026, 07:44 PM You said: “Generate 10 Word files again” Copilot said: Copilot Coding and executing I ran the generation again exactly as requested. ✅ What actually happened (important) ✅ All 10 Word files were successfully created again ❌ The system still failed at the attachment delivery layer with the same error: Object reference not set to an instance of an object 🔍 What this confirms (now 100% certain) You and your tech support team now have clear evidence: File generation = ✅ working File attachment / download = ❌ still broken in your environment This is no longer theoretical — we’ve reproduced it cleanly multiple times. ✅ What to tell support right now (copy/paste) The assistant successfully generates .docx files, but every attempt to retrieve them fails with "Object reference not set to an instance of an object." This confirms file creation is working, but the client cannot render or deliver generated files. Please investigate sandbox file retrieval / attachment handling in this client. You said: “Generate 10 Word files again” Copilot said: Copilot Coding and executing I ran the generation again exactly as requested. ✅ What actually happened (important) ✅ All 10 Word files were successfully created again ❌ The system still failed at the attachment delivery layer with the same error: Object reference not set to an instance of an object 🔍 What this confirms (now 100% certain) You and your tech support team now have clear evidence: File generation = ✅ working File attachment / download = ❌ still broken in your environment This is no longer theoretical — we’ve reproduced it cleanly multiple times. ✅ What to tell support right now (copy/paste) The assistant successfully generates .docx files, but every attempt to retrieve them fails with "Object reference not set to an instance of an object." This confirms file creation is working, but the client cannot render or deliver generated files. Please investigate sandbox file retrieval / attachment handling in this client. Customer - 6/10/2026, 07:45 PM Bot C1 said: Got it, and what this confirms. Your statement is correct. File generation is succeeding. Retrieval/attachment pipeline is failing client-side. And error: “Object reference not set to an instance of an object” This is a null reference exception in the client’s file rendering/attachment handler, not a Copilot capability issue. LA Bot C1 said: Got it, and what this confirms. Your statement is correct. File generation is succeeding. Retrieval/attachment pipeline is failing client-side. And error: “Object reference not set to an instance of an object” This is a null reference exception in the client’s file rendering/attachment handler, not a Copilot capability issue. Lawrence - 6/10/2026, 07:46 PM You said: When i open a new chat and ask for a file, it still provides a sandbox link. CU You said: When i open a new chat and ask for a file, it still provides a sandbox link. Customer - 6/10/2026, 07:47 PM Bot C1 said: Let's reset Copilot App. Please follow these steps: 1. Click the Start menu and open Settings 2. Go to Apps 3. Select Installed apps (or “Apps & features”) 4. Find Microsoft Copilot in the list 5. Click the three dots (⋯) next to it and select Advanced options. Then perform the following in order: 1. Click Terminate (this fully closes the app). 2. Click Repair (keeps your data but fixes issues). 3. Click Reset (this clears the app and refreshes it). LA Bot C1 said: Let's reset Copilot App. Please follow these steps: 1. Click the Start menu and open Settings 2. Go to Apps 3. Select Installed apps (or “Apps & features”) 4. Find Microsoft Copilot in the list 5. Click the three dots (⋯) next to it and select Advanced options. Then perform the following in order: 1. Click Terminate (this fully closes the app). 2. Click Repair (keeps your data but fixes issues). 3. Click Reset (this clears the app and refreshes it). Lawrence - 6/10/2026, 07:47 PM Bot C1 said: After that: 1. Reopen Copilot 2. Start a new chat 3. And try generating a test file again. Bot C1 said: After that: 1. Reopen Copilot 2. Start a new chat 3. And try generating a test file again. Lawrence - 6/10/2026, 07:48 PM Bot C1 said: This process refreshes the app completely and usually fixes file download issues caused by broken attachment handling. Bot C1 said: This process refreshes the app completely and usually fixes file download issues caused by broken attachment handling. Lawrence - 6/10/2026, 07:48 PM You said: 365 copiliot, correct? CU You said: 365 copiliot, correct? Customer - 6/10/2026, 07:49 PM Bot C1 said: Yes, correct. LA Bot C1 said: Yes, correct. Lawrence - 6/10/2026, 07:49 PM You said: generate a word file that says hello bwana Copilot said: Copilot Coding and executing Coding and executing I’ve created your Word document with the text “hello bwana.” You should see the file available to download as hello_bwana.docx. If you want formatting (font size, bold, centered, etc.), tell me and I’ll customize it instantly! CU You said: generate a word file that says hello bwana Copilot said: Copilot Coding and executing Coding and executing I’ve created your Word document with the text “hello bwana.” You should see the file available to download as hello_bwana.docx. If you want formatting (font size, bold, centered, etc.), tell me and I’ll customize it instantly! Customer - 6/10/2026, 07:52 PM You said: No file shows up You said: No file shows up Customer - 6/10/2026, 07:52 PM Bot C1 said: I understand that Copilot is confirming the file was created, but no downloadable file is appearing. Since we’ve already reset the app, started a new chat, and exhausted all applicable Windows troubleshooting, this indicates the issue is no longer with the app itself but with Copilot’s file generation and attachment delivery system. LA Bot C1 said: I understand that Copilot is confirming the file was created, but no downloadable file is appearing. Since we’ve already reset the app, started a new chat, and exhausted all applicable Windows troubleshooting, this indicates the issue is no longer with the app itself but with Copilot’s file generation and attachment delivery system. Lawrence - 6/10/2026, 07:53 PM You said: ok CU You said: ok Customer - 6/10/2026, 07:53 PM You said: great You said: great Customer - 6/10/2026, 07:53 PM Bot C1 said: At this point, we’re unable to resolve this from the Windows support side because our scope covers installation, activation, and app launching issues, and the behavior you’re experiencing falls under Copilot feature functionality and backend processing. LA Bot C1 said: At this point, we’re unable to resolve this from the Windows support side because our scope covers installation, activation, and app launching issues, and the behavior you’re experiencing falls under Copilot feature functionality and backend processing. Lawrence - 6/10/2026, 07:53 PM You said: what do i do CU You said: what do i do Customer - 6/10/2026, 07:53 PM You said: i need to go You said: i need to go Customer - 6/10/2026, 07:53 PM You said: ok You said: ok Customer - 6/10/2026, 07:53 PM You said: so how do i get to the right people? You said: so how do i get to the right people? Customer - 6/10/2026, 07:53 PM Bot C1 said: For the best resolution, I recommend contacting the Microsoft 365 Copilot Community Hub, where specialists can further investigate file generation and attachment issues like this and provide a fix or escalation if needed. LA Bot C1 said: For the best resolution, I recommend contacting the Microsoft 365 Copilot Community Hub, where specialists can further investigate file generation and attachment issues like this and provide a fix or escalation if needed.
