Glad things are working.
BTW, at some point you may exceed the number of folders Plex can monitor. This is common when people begin to add a lot of music or photos to their system.
If this happens, Plex will not recognize new media added to your server.
You will see the “[Notify] Failed to add watch for...” error in the Plex Media Server.log file.
The error is misleading. Your system is not out of space. The fix is to increase the Linux inotify table size.
See Plex Synology FAQ 16: Increase the number of folders Plex can monitor for the fix.