Anyone know how to make music & pictures in a btrfs-formatted microsd to show in Jolla's gallery and media player app? Manually mounting it (/dev/mmcblk1p1) to run/user/100000/media/sdcard doesn't work, so the apps must fetch their data from somewhere else, or there's another problem somewhere. The card doesn't automatically mount to anything.

My microsd has a ms-dos partition table and has no file-permission restrictions in it currently (chmod 777). Any help will be appreciated, as I really don't have that much linux command-line knowledge, it just started accumulating recently