Multi materials: How to change first material by drag´n drop?

Unity Engine
1

I have two materials on one object and want to change the first material in the editor by dragin a material onto it.
It doesn´t work, only the second material is changeable.

Any ideas?

2

whats type of problem you are facing ? In Mesh Rendrer there is Materials > Size where we can set the No. of materials for any object . you wants to change the texture of both materials ? can you please explain

3

Oh yes, you are right - stupid me!
(Unity guys could improve workflow here…)