We couldn't upload the attachment

[THOMASY]

Anyone has a suggestion on why this error is being encountered?

We couldn't upload the attachment "file.docx". Please try again later or upload to the Files section of your plan.

At a task, you click on "Add attachment" and then "File", select file to upload then the error is encountered.

The file is uploaded if I go directly to Files in the plan - however my newly upload file does not show up when I "Add attachment" then "SharePoint".  In the Documents pop-up, I will scroll down to locate it but then the listing is blank (keep scrolling down is still blank). If I sort the Modified Date column, I still don't see the file I just uploaded.

I could "Add attachment" and then "Link" to the file in SharePoint but I don't understand why I am encountering this problem.

It has been working. The file I'm trying to attach is only 35kb.

Is this a bug or am I missing something?

[#2]

@THOMASY 

Hi, I cannot reproduce your problem.   Are you able to provide some screen shots so we can see exactly what is happening please?

[#3]

Yep, very strange problem...also open a support ticket if the problem is not being solved

[#4]

@ben_projectI should have posted a screenshot in my original post.

Going through the following steps:

1) click on a task in a bucket

2) click on Add attachment button then File

3) select file from desktop

4) see screenshot below for error encountered 

These steps have been used for a long time. It just suddenly stopped working.

@Juan Carlos González Martín- I couldn't find anything online with that error message. I thought I check in with the community but it looks like I will have to submit a Microsoft support ticket.

[#5]

@THOMASY 

As you say, it should just work.  Worth trying a few different browsers and users to see if you can narrow the problem down, but if the problem is organisation wide then a support ticket is the way to go! 

[#6]

IE 11 is the browser everyone is using. But worth checking to see if another browser works. Unfortunately this error message is generic. There is a specific one that shows up if you try to upload a large file.

I'll share my findings with the community after working with Microsoft support.

[#7]

As promised, I am following up to this issue with attachments in Planner. Unfortunately, the answer is not going to be helpful to anyone else.

I opened a Microsoft support ticket. But before we could set up desktop sharing session to troubleshoot the problem, the problem has disappeared. I saw the error myself prior to contacting Microsoft support.

I am guessing there was a backend update/fix that correct the problem.

Hopefully no one else encounters this error. If you do, I can only recommend you reach out to Microsoft Support.