I've been having issues with my Pinephone detecting my music files from my Micro SD Card. I ended up buying a 256GB Micro SD card just so I can take all of my music with me on the phone, but for some reason the Music app says 'no music files detected'.
did you mount your sdcard? basically none of the distros mount sd cards by default without some extra steps
that's a question with more than one answer. I mount SD Cards by loading udiskie. others add their SD card to /etc/fstab. before, I mounted an SD card by using a bash script but I got annoyed that I had to change it every time I reformatted or changed the SD card
I'm using the UBports edition Pinephone.