Align to Path allows you to attach and align layers to single or multiple motion paths. Like Magic!
Motion Path Completion
Animate through all of your paths sequentially
When this is activated, the sliders for individual paths have no effect
How far along on the motion path(s) the layer is. Range 0→100
One slider per motion path
You can animate what % you want each motion path to contribute
If all sliders are set to 0, then you can set a keyframe like normal on your layer