Platinum Arts Sandbox - Free 3D Game Maker Forum

Do all of my mapmodels require skins to be shown in sandbox?
Some of the mapmodels imported into blender somehow already have colors on them and there is no skin to unpack from the model.

maybe they use materials? if they use materials you need to export the materials as UV texture, which can be done in blender...

how do I do that?

you should ask in blender forums, im not familiar with it...