I duplicated the epsilon song to a new folder to leave only the hitsugi song and address a new mp3 file with only that song. I changed the background and all but the thumbnail in the song selection its still showing the 2nd pack thumbnail. I replaced it in the osu/data/bt but now they are both the same so i want to create a new file for the hitsugi song and leave the other one as it is. how do i do it?