Hi, I will try to explain me the better I can and I will upload a lot of photos for improve my explanations because I don't know how to explain this, apologies in advance.
I have a model with two "parts", the armor and the body, I divide the model in two parts because I thought it would be the best form to avoid problems making the normal maps in Substance.
This parts have differents UV's and a different color (Green), the UV's of the Armor:
And blue and the UV's of the body:
I selected the two objects and exported.
And imported to Substance Painter to texturize, here I have two texture set list and everything works fine.
And the armor:
I upload the model to Mixamo (because I want to try put a breath animation) and everything works correct.
But when I downloaded the model and put it in Marmoset Toolbag I notice the model was combined in one mesh and I can't use my textures.
Because the UV'S have been combined:
If I use my model (Not the model downloaded from mixamo, the old model) and the textures of Substance Painter in Marmoset everything works fine:
I know I'm doing something wrong but I don't know what it is. If someone can tell me what I'm doing wrong and If I can do something in order to Mixamo don't combine my UV's I'd be really grateful.