Animation

• Layer placement, corners, shadow corners and opacity can be keyed: press I over a field, or Key to key the active layer (and a group's sublayers). Renders follow the keys.
• Keys follow their layer when the stack is reordered or grouped.
• With Auto Keying on, G/R/S and corner drags key what they changed.

Baked pixel selections don't animate. For a selection that follows a moving plate, use a Color Range or Select Object selection, or lasso shapes.