A head's up here (which may already been posted, I apologize if this is old info)-
Upgraded to Catalina (10.5) on my late 2015 iMac. Emby started up fine but my recordings were gone!
I found they were moved to /Users/Shared/Relocated Items/Security/Emby along with my folding @ home and some other items.
Once I told Emby that's where the folder is they re-populated.
I'm assuming this was done in an effort to protect me somehow by the OS? I dunno!