Long Press and Drag
Horizontal: hard gradient
Vertical: soft gradient
Drag (Fill Mode) (Canvas Off)
Fill a stroke of blocks
Drag (Draw Mode) (Canvas Off)
Free mode draw
Put pencils of designed color into the favorites.
Auto Coloring will color the canvas with them randomly.
Tap Auto Color.
Wait for a while depending on detail of the image.
Erase the area for Auto Coloring to fill.
Auto Coloring only works on blank or none opaque area.
Zoom the Auto Coloring area to the screen.
Auto Coloring only works on area inside the screen.