How do I save the work in progress? I want to save all the work shown on the Tinkercad screen. I've right clicked on the upper left Tinkercad icon and tried "save link as", "save limage as," and by right clicking over the name of the design "save as". None has seemed to work. When I save as HTML and then load that I get a black screen. What file type does Tinkercad save their files under?