How do I import textures from blender to Roblox?

Hello, I recently modeled a pistol in Blender and I added a metal texture and changed some of the settings. Now the only thing I need to do is import it into Roblox I have the mesh saved as a OBJ but when I import it into the Studio the texture doesn’t show up. Does anyone know how to fix this or if I need to do anything to allow it to import it all at once?

Upload the texture as decal and use the image id on the texture id.

Well the texture has multiple images in it so I how would I upload them all into one image?

You need to bake your textures, there is a bunch of youtube tutorials about it, its a hard thing so take your time to learn it