Own Folders in /var/lib/mpd/music not visible@WebUI

I’ve created on the SD card a folder for my music. Through a symlink "SD -> /music in the folder /var/lib/mpd/music is this data available for the mpd server. Per Client (mpdroid) I have access to the Music and can play it, but not in the Webfrontend!
Is it possible to add my own folders / symlinks to the web interface?

I have a partition for music mounted in /mnt/USB (I removed the original symlink from USB to /media) which works fine. I initially tried to mount in the /mnt/NAS directory, but this didn’t appear in the GUI

ok, but can i plug a usb-stick too then?

i wish there is an way in the gui to add “local” folders…

Yes, look at this link: https://volumio.org/forum/music-card-raspi3-volumio-rc1-t4185.html, there are other people having a similar issues.
Please put is as an issue on http://github.com/volumio/Volumio2
It would be a nice option to make full use of the SD capacity.