Automatically detect changes in libraries

[B C]

So I am pretty sure this isn't a jellyfin issue, but want to inquire anyway.  I am looking at simplifying my home setup, I current run unraid and it's great, but, no docker apps (I've tried plex, emby and jellyfin) seem to auto detect changes in libraries. 

I fired up a windows VM and they all work in there ok, but I would love to stick with unraid if possible.

Any ideas what I can look for or do to get auto detect to work?

Thanks in advance.