How do I start a rehearsal with a pano photo from my phone?

Follow these steps: 

1. To go to the Home Screen. 
2. Click on the “Choose From Device” button and select your pano room photo from your phone.
3. Click on “Choose From Device” and select your slide deck from your phone.
4. Click the “Start Rehearsal” button to start your rehearsal. 
5. Click the Cardboard icon to go into VR mode. 
6. Place your phone in a phone-based VR headset.