I have loaded the lowpoly and highpoly versions and did the initial bake. I want to save the InstaMAT project at this point so that I don't have to re-bake, and will want to save the project as I go. I tried using "File" then "Save Project" and save the file. When I close InstaMAT, re-open it and open the file I saved, I end up with a cube for my geometry and my tire is gone. What are the steps I need to take to save the InstaMAT project so that if I close the program and re-open it my progress won't be lost?