I followed these instructions:
Clear Teams cache in Windows
- If Teams is still running, right-click the Teams icon in the taskbar, and then select Quit.
- Open the Run dialog box by pressing the Windows logo key
+R.
- In the Run dialog box, enter %appdata%\Microsoft\Teams, and then select OK.
- Delete all files and folders in the %appdata%\Microsoft\Teams directory.
- Restart Teams.
However, the problem was not resolved. I opened the file, in this case it was a powerpoint. The file did not include the latest changes that were made by my colleague. Opening the file in Browser worked. But opening in app (i.e. Powerpoint) did not work.
Also, it seems I cannot set 'Open in App' as the default action when I click on the file. Is this the new behavior of the latest version of Teams, or is this a result of deleting all the files in the cache?


In the past, I resolved the issue by downloading the latest version from the Browser, deleting the file in Teams, and then uploading the downloaded file back into Teams. Of course, doing so was a work around. But it was an expedient solution. By the way, I encountered this issue with MS Word, Powerpoint, and MS Project. So, this problem is probably not filetype specific.
Another bit of observation, sometimes I turn off autosave so that I don't accidentally make changes to the documents. Could turning off and turning on autosave while another person is working on the same document lead to this bug?
Is there a cache related to the Office Apps? Maybe there is a temp file stored somewhere that should be deleted.
Anyhow, any other recommendations?