UPDATE: You can now choose to take the 'after photo' OR choose a saved photo to use as the 'after photo'.
CHOOSE A BEFORE PHOTO
Tap to open the 'Before Photo' and tap the 3 dots (upper right corner).
USE CAMERA TO TAKE THE AFTER PHOTO
Choose 'Take After Photo', line up the image and snap the photo.
Optional: Tap the outline icon (see image below) for the green outline feature.
CHOOSE THE AFTER PHOTO
Tap 'Choose After Photo', select an image and save.
CHOOSE A TEMPLATE
Template options are across the bottom of your screen. Tap on a template to preview the image and then 'Save'. (upper right).
Here's a quick video if you'd like to see the Before & After Camera in action: