music folder, what is it for and how to use it ?

Hi, I'm new to FileRun, I have several folders in the "my files" section filled with music only (wav and mp3) if I click on any of these tracks it opens the player, and the browser shifts to music mode ie everything works fine.
But what is that music folder on the left side," last added, artist, album, random" ?
There's never anything in there and can't find a way to add music in there.
Also all the tags from my mp3s are ignored