How do I import Model's into the map?

Level 9
Oct 6, 2007
Ok, I'm making a Terminator map, and I saved a few Model Files onto my Desktop and put them into a folder called "Wc3stuff"

I want to import the Laser Model and put it in as an attack projectile. When I put the file in the Import Manager, and I go to the Unit I want to have the Laser Projectile, the "imported" button is grayed out.

How do I import stuff and then be able to use it?:cry::cry::cry: