Add Animation Layer
Creates a new absolute or relative Animation Layer, respectively, for the object(s) currently selected in the Object Manager. If an object does not have a Motion System tag assigned to it, one will automatically be assigned.
The difference between absolute and relative Animation Layers
Normally, relative Animation Layers are used (the active Animation Layer will be added to the one below it). When recording keyframes only the relative offset to the underlying Animation Layer will be recorded (and not starting at 0), i.e., if an object was positioned at Y=200 and a keyframe was recorded on an Animation Layer at Y=210, the keyframe on this Animation Layer will be assigned a value equal to the difference: 10.
On an absolute Animation Layer, this difference would be animated as an absolute value of Y=410.