Installed DTTG3, accepting its offer to automatically transfer my DTTG2 stuff. Configured Dropbox, and it correctly found the sync stores for my existing databases and correctly populated a complete index.
Bookmark items work fine, and I successfully created a new Bookmark and a new RTF item.
And then I moved on to the PDFs … and discovered that all of them were listed, but none of them were downloaded. Message says “Unable to display document. The file you’re trying to access is either not a PDF file or might be corrupted.”
Brought up DevonThink on the Mac, confirmed that I have the latest version and that all those sync settings are fine, which they are. Discovered that the new files I created with DTTG3 aren’t coming back to the Mac, either.
DTTG2 is still installed and still working correctly, so it doesn’t seem to be a Dropbox issue.
The iPad is running iOS 14.3 and has more than 17 GB of free space.