Amorgos Fine Velvet Bedding Set

Ir is not how it look in the picture but we made it work cause i hate going through the process in sending things back especially if its too much packaging

What is the trick to put a comforter inside the bedding? The material is very nice but is slick and comforter slides around and balls up?

Very soft and beautiful but I tried to put a comforter inside and the material is so slick??