I am getting this error as well (using macOS 10.15.4/Devonthink 3.0.4), and am syncing via iCloud. I am not certain but I believe this happens only with one of my databases that is syncing and it is an index-only database (except for inbox, which is a clearinghouse for items before their moved to their indexed-folder locations). Not sure if that might have anything to do with it but also tracking this topic in case this is ever figured out.
FWIW, I don’t notice any issues with performance on this database and have not had any problems in DTTG on the database I suspect is having this error.
I get this error message when sync with iCloud - I see this as mission critical because I need confidence that my data is being correctly 100% in iCloud. I have one other device in sync. I cannot go round checking to see if every document is properly in synch.
Welcome @MichaelAWhite
As mentioned above it is an error reported from iCloud, not an issue with sync itself. iCloud is not as reliable since the changes they made for Catalina and iOS 13.
We are working on an alternative for a future release.