Hi Jonnytar, I think to use the GC for embossing folders, you have to have something called a raspberry plate. I assume it's thinner than the other plates, since the embossing folders are thicker than the dies. If I remember right, I think you can also use the thin Cuttlebug and Sizzix dies with that as well.
I think my GC does a better job with cutting and embossing the Spellbinders dies than my Sizzix, probably because it was made for those. I always use my Big Kick for embossing folders, since I don't have the raspberry plate yet.