I recently added some beatmaps but now they're gone when I closed the game and come back the next day, old beatmaps are missing most of their difficulties, and some beatmaps are not there at all even though they're present in the songs folder.
And there's always a massage in the bottom right saying "osu! doesn't know how to deal with this file type".
And there's always a massage in the bottom right saying "osu! doesn't know how to deal with this file type".