Hello everyone and thank you for helping me with this frustrating problem,
I wanted to put this texture to my terrain material (on my inspector) but suddendly my mouse icon start shaking while im holding the texture and dragging it to the little box “None (physical material)” on the inspector.
Furthermore, there is another icon that show up above my mouse icon like this “⦻” showing me I can’t drag.
I specify that i’m on windows and that I didn’t had this problem when I was on MacOsX.