I don’t see any logs attached to your posts
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Please look in the Plex shared folder. Confirm there is no “Library / Application Support / Plex Media Server” shared folder anymore.
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If the “Plex” shared folder is empty – migration was successful.
– if not, then we need set permissions (again) on the Plex shared folder and repeat migration to DSM 7 -
Presuming migration completed ok
– The easiest / quickest way to reclaim ownership of PMS following migration is using the “Plex Claim Token” method shown here
