Metadata Sync Lost after Synology DSM 7.0 update

Don’t panic.

It should be Migration.log

That said, ALL of your server’s metadata is now in the new PlexMediaServer shared folder.

DSM 7 forced a complete rewrite and restructure of everything.

Plex share → PlexMediaServer share – for metadata only (NO MEDIA)
Plex user → PlexMediaServer service

I would first like you to look at this. If I have surmised correctly, all you now need to do is grant permission for “PlexMediaServer” to see your media.

Here’s the How-To.