By "files" I take it to mean you had emails in folders that have attachments to them? Can you see the folders they are in?
No. All the files and folders have disappeared.
If you cannot see the left folders pane, see if this sorts it out for you----------------
In my left pane I am showing nothing. No Xfinity, No show folders.
Did you click on the link I posted upthread?
Yes, I did click on your suggestion. It did help emmensly. However I was using the Google Chrome browser. When I changed to the Edge browser all my folders reappeared.