iCloud Drive documents missing

I got a little bit of problem going on with iCloud drive. Most of my documents are missing. I checked in all the usual places like the sidebar under icloud drive and in the sub folders.
Any ideas would help. I doubt if they are lost forever but maybe I’m missing something here. Thanks for all the replies.

Three quick ideas.
Did you check the web interface for the files? Are they missing there?
Who has access to the iCloud drive. Did they clean up “their” space by deleting files?
Did you try a few hours/day later? Sometimes I find iCloud freaks out but is there a bit later.