Importet Skins on Xbox Series X

I have a problem on my console that I cannot load skins from a storage device (USB stick) into the game as desired and despite the available function. For example, downloaded a skin from Sindex and copied it to a stick and then plugged it into the console and went to the file manager from the game and selected the skin. Now there is the problem that when I choose the skin now, I get back to the game, but this skin preset stays gray and doesn't set me the skin, so I'm forced to buy good skins with money... despite that there are now the opportunity to do this. Maybe someone knows what could be the reason. Thanks in advance