I have had plex media server on several different servers and plex media player on several different devices for many years. When I sync media, it always ends up disappearing from the local media view. It is in the sync status menu, It shows the downloaded arrow on the media when viewing the media on the remote server and The files are there in the random numbered folders it creates. Yet, sooner or later, plex ends up with nothing in the local media view. It seems to lose the file location. This has happened for so many years, all updates, all platforms. I think it has something to do with the file naming system plex uses, the random numbered directories and every song being named key.mp3
I have considered this feature useless and today I no longer use it. It is nothing I am doing. I should be able to click on my music library on a device and sync it, but after some time, for some reason, plex decides it can't find the local files.
Booo plex, stop building useless features like cloud support and VR experience and make the original product that I paid for actually work.
This rant is out of frustration and not being able to sync my friggin music library on to my phone.