Following up on @nibbles reply…
Metadata, etc. info is stored in the Plex database and is not touched by the claiming process.
Use the URL @nibbles mentions to make sure your server is claimed (or go to Settings → server_name → General).
If you uninstalled Plex Media Server and chose the “Erase all” option (in red), then that deleted the database and other info in the Plex Data Folder. It can be recovered if you have a backup.
Uninstalling with “Uninstall Only” or “Sign Out and Unclaim” will not touch the metadata, database, etc. At most it removes entries from the preferences.xml file.
Getting back to your issue of missing libraries.
This is for DSM 7.x. If you’re running DSM 6, write back and we can change as needed.
Question: Did you alter the permissions for the Plex Data Folder? If so, stop Plex and follow FAQ 32: Repairing the PlexMediaServer shared folder.
Login to the NAS and use File Station to navigate to the /Plug-in Support/Databases
folder in the Plex Data Folder.
You should see the com.plexapp.plugins.library.db
and com.plexapp.plugins.library.blobs.db
files. If Plex has made backups, you will see those same files with dates appended.
You can try restoring a backup version of the database.
- Stop Plex Media Server.
- Using File Station in the /Plug-in Support/Databased folder:
- Rename
com.plexapp.plugins.library.db
tocom.plexapp.plugins.library.db.bak
andcom.plexapp.plugins.library.blobs.db
tocom.plexapp.plugins.library.blobs.db.bak
- Delete any files that end
-shm
or-wal
(they normally disappear when Plex is stopped). - Pick the backup date you wish to restore.
- Rename the files, removing the date so they end in .db.
- Start Plex Media Server.
Wait for Plex to fully start, then login to the server.
Go to Settings → Manage → Libraries (not Library). You should see your libraries listed.
Rescan to pick up any new media added since the date the backup was taken.