The Music app still does not support playback of FLAC files - this is par for the course for software written in 2001 but in 2022 it can probably just be considered broken/nonfunctional. Doesn’t serve the needs of the modern music aficionado. They’ve completely neglected the music side of things. No wonder why iPod sales stagnated so much they had to discontinue the whole line of a once iconic/revolutionary product.