ext4 usbdrive dont show in Volumio

Hi folks,
when I use an ext4 usbstick it is mounted (checked in shell) but never shows in Browse/Mucic Library.
Ntfs or vfat works as intended and i can access the files in Volumio.
I tried to alter udisk-glue.conf but to no avail.

So I cant using my linux sticks with ext4 on Volumio. Whats wrong?
Any ideas?

Regards