I'm on a trial of Atom3D. The main thing I can't figure out right now is how to import a file and use it as a sketch for a 3d model. I believe Atom3D only supports DXF/DWF, but if I convert my file to that version and open it, I can't do anything in 3D with it. Are 2D and 3D sections of Atom3D cut off from each other, or what am I missing?