QNAP: Adding a library

[Eman Resu]

Hello,
I'm new to Jellyfin and successfully installed the Jellyfin Docker on my NAS (QNAP TS-451D2).
My music library is in /shareCACHEDEV1_DATA/Musik

Unfortunately I cannot find this folder in the pull-down menu when I try to configure the library.

Any advice would be appreciated.