Hi!
I’m working on a creature I want to render in Marmoset toolbag. I want to use two materials on a single object but Marmoset only gives me a one UV channel per chunk. I’ve read that Marmoset only supports one UV channel for each object, so in theory what I want to do should be impossible. But to make things more confusing I also read somewhere that several UV’s should be possible with FBX import (I haven’t managed to get it to work so far). I also made a big worm creature 1,5 years ago and managed to render it with 3 different UV’s in Marmoset. It was a long time ago though and I don’t have the export & marmoset files anymore so I can’t check it and I can’t remember how I did it back then. 
So if anybody knows how I can use material ID’s/several UV’s on one object in Marmoset, please tell me!