I downloaded the Yughues Free Pavement Materials. but I cant open the files when I imported them into unity. what should I do? thank you!
You can’t open the files? Do you mean you can’t apply the materials to an object? :o
Try dragging and dropping the materials from you Assets to the target GameObject.
If that doesn’t work, You can actually click on the GameObject and drop the material directly onto the Renderer component of it.