Importing ASCII Geometry

I am completely new to Comsol so I really am struggling.

Can anybody explain how I can import some flat panel polygons I have defined as a series of x, y, z position vectors in ASCII into a Comsol file geometry.

I have used Matlab to create some CAD dfx files and tried doing an import. Everything looks like it is going fine then just get a "no geometry imported" error message. (See attached screenshot)

I also have Matlab LiveLink.

Any suggestions would be greatly appreciated,