Switch from iCloud (legacy) to Cloudkit

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Welcome @netcarlos

A search of the forums would have yielded this…

Moving from iCloud to CloudKit syncing

There is no migration between sync locations. The sync methods don’t share data. Note: If you are switching to CloudKit, at this time we suggest syncing one database at a time as we try and gather information on two domain errors a few people have reported. If you are only syncing DEVONthink on a Mac… Enable the iCloud (CloudKit) sync location, entering an optional encryption key, if desired. Enable a database to sync. After the sync is finished, enable the next database to sync and repeat, …