Viewing the 3D Model with the 3D Viewer App, which is done after selecting "Export Chief Architect 3D Viewer File". This is what I do, and I select the icon (see attachment).
After I do that, the display isn't stable.
You've demonstrated the 360* Panorama viewer. I can't open this file with the 3D Viewer App. However, I CAN open Safari on my phone, navigate to the Chief Architect web site, then, log in. There, I select "Manage 360* Panoramas". When I see my list, I can then click on "View" for one of my Panoramas. Again, this is from Safari on my iPhone.
Then, when the Pano opens, there is a goggle or viewer icon in the lower right, just left to the full screen icon that you've shown in your first photo. I click on that. Now, if I hold the phone in portrait orientation, nothing happens. BUT, when I rotate the phone to landscape orientation, I get a proper 3D display! That works!
Ok. My conclusion - the 3D Pano works through the web browser. The 3D Viewer App has not fully implemented this VR functionality. It's possible that this is in the future. If it comes, I'm hoping it promises the ability to walkthrough the model, similar to what can be done with the Sojourn controls in the app.
Thank you for those photos, it helped me zero in on this!
MattCarp's post in 3D Viewer VR Goggles - image unstable? was marked as the answer