I installed beets docker and set music and downloads folder to /mnt/user/ in both fields which seems to be working as i can get a page up but it is empty nothing there for me to click to change parameters or add anything, i tried setting the docker music field to /mnt/user/music/ whcih contains all my music but then the docker doesnt work...i have not had trouble setting up dockers in this way before and am wondering if i am missing something or theres more needs to done.

Beets is predominantly a command-line tool, you will need to import music into the Beets database before it will show in the webGUI.

This should get you started,

docker exec -it Beets bash