Inserting Decals into Blender?

Hello there!

So what I am trying to do is simply put decals and textures that are in my Roblox character models into blender to make some renders.

However, I when exporting the model with the decal the surface with the decal just ends up being white. While I haven’t attempted anything else yet. I just wanted to reach out and see if anyone can point me in the right direction before proceeding.

Thank you!