If you have a 3d object that you wish to add to Studio, tweak to optimize to use in Studio, Import is the right choice. Select a 3d file (.obj, .stl file types supported) and decide a size option. If you are unsure how big it will appear, select “Draw a bounding box to decide the object size” option. You can decide an imported object’s size as you draw a bounding box. You can also import it to the viewport as a fixed size.