I have searched extensively, but I am unable to find the answer to what seems to be a most basic question: In what format do I upload 3d files to the content uploader? For example, I created a basic prop in Blender. In what format do I export it to keep the materials/textures and import them into the content uploader? If anyone can point me to a list of formats for various types of content, I would sincerely appreciate it!