Animation Desk Classic supports one background layer and two drawing layers (Foreground and Middle ground).
To manage layers, tap on the layer icon on top of the canvas. You can choose which layer you want to draw on. The layer you are currently drawing on will have a pen in front of it.
To add image to your background layer, tap “Background” and choose the image you like from your device. The image you choose will be the background throughout the entire project.
To clear the drawing on any layer, click on the on the lower left side of the canvas. You can choose to “Delete Frame” or “Clear Content” on the layer.