In layers pane, click toolbox item and select layer type to add a layer.
Select the layer and set static properties of the layer.
Motion properties of a layer are dynamic properties.
By default, a layer has a motion point at the begining of timeline. There may be multiple motion points in the timeline. That's to say, motion property value can change from time to time, it leads layer animate in the timeline.
Select the begining motion point of a layer to set initial motion properties of the layer.