I put an MP3 file I created(Played it on a keyboard) into FeralHeart's sound folder, and it is named walk_grass, but there isn't any sound where that new file should play(When I walk it's silent), it didn't break the normal walk sound though. This is not a very urgent issue at all, as I play FH with sounds off most of the time.
What could be causing a sound file to not work?