Devonthink 2.7 WebDav sync with Owncloud 5.0.7 (Debian)

I am trying to sync a single database to a WebDav server running ownCloud 5. Most of the time, the sync is stuck at “Fetching remote records” (even with a fresh sync, i.e. no data on the server) or a “File not found error”, although the entry is present in Devonthink. The database is verified/repaired and optimised.

Occasionally in the past, a sync completed successfully, but only with a test database and a few rtf entries.

Thanks you for any leads.

Regards,
Greg

Please open a support ticket.