I have a QIDI Tech Shadow 5.5S. I have contacted QIDI Tech and was informed that I need to save in a .CTB format. The first test print on the memory stick is a,CTB file it printed great. From all the options "Save as" to "Save project" it does not seem to be there. I have tried all the available formats (.stl, .obj, .chitubox) The Shadow 5.5S will not recognize any of them nor print them?