Homebrew Genplus GX covers help

[Alfio_Da_Italian_Nerd]

Hello there. I have the Genesis emulator called "Genplus GX". I used a method to use covers, putting in the "snaps" folder.

So.... I made a custom cover for "Super Mario World" (a bootleg Mario game for Genesis), bot it doesn't shows up

So anyone can tell me how to put custom covers on Genplus GX?!?



P.S.: The PNG file and the ROM file haves the same name, so...

ROM file: Super Mario World.bin
PNG file: Super Mario World.png

And also is in 320x224