Did you upload the file from the place shown below?
Here are a few ways to troubleshoot this issue:
- Check if there is an issue with the Teams web client: https://teams.microsoft.com.
- Check that your network connection is working, or switch to a different network.
- Check if your OneDrive and SharePoint are working or if there are any glitches or limitations.
- Check that your files meet the requirements for Teams.
If all of the above issues are ruled out, run the following tests to diagnose:
Run Tests: Unable to upload files to Teams chat.
Hope this helps! Moreover, if the above is not your scenario or I have misunderstood anything, please correct me and provide us with detailed information about the issue including the screenshot so that we can better understand to further assist you.
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