The first time you open a pdf file you will need to trust the file and click once onto the page before any 3D graphics will be displayed.
Step 1: When you first run a file you will be shown the following.
Step 2: Select one of the options from the Options menu.
Step 3: Click anywhere in the center of the page. Note that you will not see the text “Click Here To Start” this is just shown here for demonstration purposes.
Step 4: You will now be shown your exported 3D content
Step 5: By clicking in the scene with your mouse you will be able to move the model around, select parts of the mesh. If you select a part of your mesh and then right click you can also isolate just that part of the model via the popup menus.
