Touch gestures

Undo . . . . . . . . . . . . . . . . 2 finger tap

Continuous undo . . . . . . 2 finger hold

Redo . . . . . . . . . . . . . . . . . 3 finger tap

Continuous redo. . . . . . . 3 finger hold

Cut/Copy/Paste . . . . . . 3 finger swipe down

Fullscreen . . . . . . . . . . . . 4 finger tap

Clear layer. . . . . . . . . . . . 3 finger scrub

Zoom in and out. . . . . . . pinch

Fit to screen . . . . . . . . . . . quick pinch inwards

Undo fit to screen . . . . . . reverse pinch

Rotate . . . . . . . . . . . . . . . . 2 finger rotate

Quickline . . . . . . . . . . . . . draw and hold until snaps

Merge layers . . . . . . . . . . pinch together

Select layer . . . . . . . . . . . swipe left to right

Layer opacity . . . . . . . . . 2 finger tap

Alpha lock . . . . . . . . . . . . 2 finger swipe left to right

Select layer contents. . . . 2 finger hold C