Been getting this error message in my app notifications an awful lot recently. It usually happens after I've added a new file via the share function on my Android tablet, though there may have been other circumstances too. (The most recent one was such a file, but this time the error occurred when I manually set the file to be available offline.) (Clarification--when I share the file/upload it to Dropbox, that part works okay. But it for some reason then says offline files failed to download although that wasn't what I was attempting to do.)
It may be a false alarm message, as when I then force a sync to update my offline files, I never notice it downloading anything new, and that function always seems to work okay (so far). I haven't been offline yet to prove if files are actually available or not, though.
I will update this thread in a moment with my app version and system info.
Dropbox app version: 358.2.4
Samsung Galaxy Tab S6
Android 12
This is something that's started occurring in maybe the past couple of weeks, unsure, but it's recent.