FLAC files not showing up in MUSIC screen: they are in FOLDERs screen (but order is wrong?)

Also how efficiently written the decoding software is. The main effort to make code efficient for Sandisk players is for decoding mp3 files. Other formats are just an afterthough. So it might be possible to make software for playing other formats almost as efficient as for playing mp3 files(and perhaps in some cases even more efficient), however that doesn’t seem to happen with Sandisk firmware. I guess using Sandisk firmware battery life for FLAC might be around half that of playing mp3 files?