Tap the layer button to display layers
Tap on a layer to select it
Tap on the gear icon for options
Choose Multiply mode to change the blending mode of the layer
Choose Screen mode to change the blending mode of the layer
Slide the opacity cursor
Choose Hide mode to hide the layer
Tap on the gear icon on the paper:
- Select paper grain
- Select paper color or create your own
Layers as transparent .png are saved when you export a multi-layered drawing