Railworks America

I decided to begin my experience with shape creation by making a simple rock, to which, I wish to apply a texture. I have selected RW Material from the list in the mapping browser and have applied the texdiff shader and the texture image to the RW Material that you see in the photo. Yet, for some unknown reason, I cannot apply the texture to the object. Although I am quite new to this, I believe I have followed all the instructions in the Developer Documents to create a scenery object in 3ds Max.

The following is a link to a screenshot of the 3ds Max User Interface that I have reached so far. Please have a look and see what I am missing here. I ought to be able to click the button to assign the selected material to the object, refresh it in the viewport, and see a textured rock. Yet the rock still shows up grey. Where might I have gone wrong?

https://1drv.ms/i/s!Am_QWgQp3sf0gcR9DyN690KpY8C0xA

I solved the issue of applying different textures to different sections of the shape.. When "Railworks Material" is selected in the material editor I was not aware that the word Railworks Material is the naming box for the material. For that reason, I could only apply one texture to the entire shape because the program kept telling me that Railworks Material was already in use. All I had to do was give the material a new name.