Help, Pictureflow doesnt display the album art for me [ipod classic, 5.5th gen]

[Carlminion]

I don't know if I'm doing something wrong but I have the album in a folder with a bitmap named cover.bmp as well as a png named cover.png. I've also added it through iTunes, yet it doesn't show the album art despite showing it everywhere else like in iTunes and also in the Rockbox music player.