"Your changes could not be saved" when adding/ editing/ deleting library paths

Plex Media Server
2

PMS easily copes with path changes.

Changes cannot be saved:

  1. Check overall path length. Limit is 40K bytes
  2. Make certain DNS and gateway working correctly on the new host.
  3. Directory permissions 755, files 644.
find /media/dir/1 /media/dir/2 -type d -exec chmod 755 {} \;
find /media/dir/1 /media/dir/2 -type f -exec chmod 644 {} \;

You can add as many top-level directories as you need
You can also apply this to the Plex directory (where your server metadata is)