I've been having this problem for a long long time. Would love some help.
I have my most used catalog stored in the Creative Cloud folder so I can also access it from my laptop when needed. Occasionally it works perfectly but these days, more often than not, I get the message "unable to sync due to server error". The difficult thing is that there is no consistency to the issue making it very hard to diagnose the cause.
I never run the catalog on both computers at the same time. I always allow one to sync before opening the other. There is also no issue with the naming of the files.
Looking at the current occurance it seems to only be smart previews that are not syncing. I discarded all of the smart previews in the catalog and built them again to see if that would work. I've also tried logging in and out of CC. I have deleted the program and reinstalled it before but I don't see the point of doing it again.
Perhaps if I were to delete the program and reinstall it the syncing would work again. But the real problem is why I seem to be in this never ending cycle. It works for a while, then the problem comes back. I troubleshoot it by doing one, if not all, of the steps above. And it fixes the issue. Then it comes back.
I'd really love some advice here. Should I just stop using CC for this? Maybe try Dropbox instead?