Thank you for your screens. I tried to test it in my lab but failed to reproduce it, the file list shows immediately. According to this symptom, I consider you can firstly login Teams Web App to see if list would show up normally. Besides, one potential cause
could be the traffics and high latency, or server temporarily busy. You may give it some time and then monitor its behavior.
Besides, you can try to clear Teams caches to see how it goes:
Close Outlook and Teams, go to File Explorer and type %appdata%\Microsoft\teams. Then delete the following files. You can move the files to another place to avoid the data loss:
a. In Application Cache -> Cache folder, delete all files in it.
b. In Blob_storage folder, delete all files.
c. In Cache folder, delete all files.
d. In databases folder, delete all files.
e. In GPUCache folder, delete all files.
f. In IndexedDB folder, delete the .db file.
g. In Local Storage folder, delete all files.
h. In tmp folder, delete all files.
I. Delete the file “settings”
It’s also suggested to confirm with other members and check if they’re experiencing the same issue. Welcome back and share with us if there’s any update.
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