how to add a single image background

Hello

I am trying to add a background image to my menu items,

I go into the customize menu, choose the right menu and then background, select single image an then I get to a place where I can browse a source called Fusion and zip file called script.module.metahandler.

How come I can’t browse anywhere else.

Sorry if this question seems stupid for you guys, I am a newbie in the wonderful world of Kodi

🙂