There’s a mode for that! Click the circle in the lower left hand corner and select “Barrel Roll”.
1. Set your roll direction (clockwise or counter-clockwise)
2. Set your speed (at the top of the screen or with the left/right buttons on the D-Pad)
3. Roll camera and trigger the move to start rolling!
Pro tip: Get ready to adjust your grip as you go upside down, and keep your subject centered in the frame!