Can you use the iCloud new folder sharing capability to sync between users?
DEVONthink isn’t using a casually accessible location for syncing to iCloud.
It may be theoretically possible via a local sync store in a folder in iCloud Drive but it would still consume space on each machine - in addition to the space used by the database, if it is possible.
However, we have no concrete data on this, so I would say no until further notice just to be safe.
We’ll have to see if it is feasible or not.