Hello I faced again a problem that I encountered really often but this time I really need to solve it. I can't change the texture of a body in an assembly.

If I change the part, the modification doesn't propagate to the assembly. To make the things more strange, the only thing I can get  is the texture change of two small surface that apparently doesn't have a separate texture. The body is an organic mesh                                     

Does someone know how to solve this bug?

Thank you in advance,
Marco