The directory changed on the MAC seemingly. Files missing, not in deleted or activity. They are a ghost. Was able to open my PC without internet and still have them, paused Dropbox sync turned on the internet again and tried using a Dropbox link from a missing file (these are Adobe Illustrator .ai files) but got a "we have interrupted your sharing activity…" message. Tried searching for a file by name on Dropbox web, first got an error, then subsequent searches show nothing. I have been paying Dropbox Plus 2TB for over 10 years because I don't want drama, like this. Super unhappy.
