(C4d R 10.5) Importing in Unity one mesh with multiple materials problem.

So i basicaly created a cube,selected 3 sides (poligons) of the cube,Set Selection and aplied a material and i made the same with the other 3 side just that i aplied a second material.

I export to unity and instead of 2 materials i get just one

(it worked before but i dont remember how i did it )

please help Thanx in advance .