Prop won't appear in gmod

I am a noob to modeling.Here is the problem, I made a prop, and it shows up well in cs:s without any problems, but when I import the files to garrysmod, it does not appear. I can spawn it in the game
but it’s “invisible”. does anyone know how to fix this? thanks in advance.

You probably didn’t import all the necessary files. When I was a noob and I didn’t know how addons worked, I used to import the files 1 by 1 from the Browse tab in the Q menu.

Did you make the actual prop? I know you said that, just wanna make sure you MADE it. Or did you dl it.

Yes I did, I placed it on a map for cs:s and when I ran the map, it appeared as a static model.