Update for paid users of Plex. If you’ve paid for Plex, you’re likely using a “Premium Music Library”. As per general announcement issued yesterday: " Starting July 1, Plex Media Server version 1.15.8 or higher will be required to continue to add music to Premium music libraries." That means, Thecus users using a “Premium Music Library” will not be able to add music anymore. I guess the workaround would be to convert your music library to a “regular music library” which presumably would require rebuilding of any playlists. I’ve asked Thecus for an update.
Full announcement:
