Microsoft 365 Copilot + SharePoint

Hi mcheatham​ 

1. The 150 MB file size limit Right now, Copilot won’t process files bigger than about 150 MB in the chat experience. That’s a hard limit in the current design, and it’s there because of how Copilot breaks content into chunks for the AI to read. Microsoft has said they’re working to expand Copilot’s capabilities over time, so bigger files should be possible in the future — but there’s no confirmed date yet.
2. Multiple files = multiple summaries If you upload several files at once, Copilot will give you a separate summary for each one. It doesn’t yet combine them into a single, merged summary. This is something a lot of people have asked for, and Microsoft has acknowledged the feedback, so it’s on their radar.

What you can do in the meantime

• For large files: split them into smaller sections (by chapter, heading, or logical break) before sending them to Copilot, then stitch the summaries together.
• For multiple files: merge the relevant parts into one document under 150 MB, then run that through Copilot for a single summary.
• Or, instead of uploading, use Copilot inside Word, Excel, or PowerPoint to ask targeted questions about the content stored in SharePoint — sometimes that’s faster than summarizing the whole thing.