I've got some .mp3's in my download folder and they will not show up in my library no matter if I drag and drop, go to File>Add to Library, or even if I double click to play the song. Anyone else having this problem? No clue what to do.
I had this issue, just sign out, add music, sign back in and it works. When I did it, I didn't have to re-add anything, just searched and it worked.