You can find the layers in the left part of the timeline, at the bottom-left of the interface. If you are using Callipeg in left-handed mode, the layers are in the bottom-right corner of the interface. If you can’t see the layers or the timeline, tap on the 3rd icon located on the left part of the top bar (on the right part if you are using the left-handed mode) to toggle the Timeline.
To add a new layer, tap on this icon to access the different types of layers. The number next to this icon indicates the number of layers. 
Add a layer by tapping on the drawing, video, audio, transformation (diamond) or group icon. There are 5 types of layers, the Drawing layer, the Video layer, the Audio layer, the Transformation layer, and the Group layer.
The Drawing layer is the basic layer on which you can draw your animation.
The Video layer is a layer in which you can import videos.
The Audio layer is a layer in which you can import, record and edit audio.
The Transformation layer allows you to use keyframes and curves to quickly animate the content of Drawing layers.
The Group layer allows you to nest other layers inside of it and create a hierarchy to better manage your load of layers. Double-tap on the name of a layer to rename it. If the name is too long, pinch your fingers apart on the length of the layer to hide the layer icons and give more space to display the name. Pinch your fingers together to get the icons back.
Double-tap on the name of a layer to rename it. If the name is too long, pinch your fingers apart on the length of the layer to hide the layer icons and give more space to display the name. Pinch your fingers together to get the icons back.
Tap on this icon to paste a layer from another shot. 
Tap on this icon to open the import options. 
Tap on this icon to select all the layers at the first level of hierarchy. One more tap will deselect them. The horizontal bar at the top of the layers pile appears when you have more than one layer and allows you to expand or decrease the timeline and layers by dragging it up and down.
To move a layer drag it up or down the pile, the orange rectangle indicates where you can drop it.
Swipe from left to right to select one or multiple layers, which turn orange. Tap anywhere in the layer pile to deselect.
This arrow allows you to change the current layer by selecting the pixels on the canvas. Touch the arrow to enable the selection, then touch the screen on the canvas and move without lifting the pencil to look for the layer you want.
If there are multiple layers on top of each other at the selected pixel, you are able to choose the layer in the displayed list.
Touch the name of the layer in the list to set it as current.
