Trying to import an obj file with colours in unity and this is only grey

Hi!
I am trying to import an obj file in unity. In Rhino, the face has colours, and in unity, there is nothing, only grey.
I am learning unity.
Could you please help me? Is it come from the file, or something to do in unity? I was tryning too, to import in fbx, and it is the same thing.
Thanks so much if you can explain me!
I give here the file in fbx in a unity package.