Yeah you need to rig it to each character, but when uploading it has buttons to choose class, then you pick the right model. (You can upload all classes as one item).
There's a tut for paint if you look. I'm too lazy But the painted part of your texture should just be the plain ao bake in your texture. The game overlays rgb colors to change them. When importing you specify the rgb values for the start colors. paint cans just change that number.
I think (been a bit) the alpha of your diffuse is for the paint area.
The uploader/compiler (which you obviously used) has checkboxes for everything.
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There's a tut for paint if you look. I'm too lazy
But the painted part of your texture should just be the plain ao bake in your texture. The game overlays rgb colors to change them.
When importing you specify the rgb values for the start colors. paint cans just change that number.
I think (been a bit) the alpha of your diffuse is for the paint area.
The uploader/compiler (which you obviously used) has checkboxes for everything.