two uvs in one mesh

I guess that this argument has been discussed too much, but each one has its own details, so I post mine. I loaded in the editor a mesh with 3 materials, of which 2 share one texture which is mapped in a uv, whilst the third has a texture which is mapped in separated uv. The imported mesh visualizes only the former 2 textures: the third texture doesn't get visualized. What happens?

 

I don't think Unity's built-in shaders support multiple UV maps. You'll have to make your own shader.

 

A 10 years problem.

 

You don't mention changing Materials > Size to 3 on the Mesh Renderer, then filling the 3 Elements with materials. Have you tried that?

 

Nope, I didn't tried that, simply 'cause I wasn't aware of such an option.

 

It isn't the most obvious option, but can be useful. Hopefully it is for you.

 

Added a third material (btw, the other two materials was already filled and listed). When I release the model, the third one vanishes. The object got anyway 3 materials. Perhaps it is me the one who's mistaking something.