After taking a break from Devonthink (because of working in a multi-OS environment) I am back to using beta 2 of version 3.0. Everything is working smoothly except for sync to DTTG. I am syncing via iCloud and everything appears fine when I set it up on my iPad and iPhone. No error messages. The Global Inbox syncs fine as well. Problem is that I do not see my other databases on the iPhone or iOS.
I have verified the databases in Devonthink (desktop), so the syncing appears to work fine on that end.
In case it matters this is on iOS 12.3.1.