Hi Seven,
Sadly this is affecting other members of my team as of last check yesterday. Also there is no sign of a copy link under the file option - Only copy link I get is for the channel and not for files.
Currently it looks as though I have lost all of the files that were there - This is quite upsetting - And the other replies I had up to now have not even pointed in the right direction - Currently I feel it may be best to cut my losses and delete my Teams Org - And find another more reliable way to have meetings with file sharing. I do hope that somebody can find the files and I dont have to resort to using a less preferable service.