@colin, I installed the extension and tried to export the file following the instructions listed on the link you provided (I tried all three options of export) and it’s giving me the following error message each time 
I quit SketchUp and reopened just to make sure the plugin installed correctly too, but no luck
Any suggestions? Maybe it has something to do with all of the images as mentioned in this thread: https://forums.sketchup.com/t/orbit-bug-in-mobile-viewer-thats-not-in-desktop-viewer/18410?u=tysongersh