Automatic Duck Pro Import AE 5.0 (Win 64-bit for CS5 or CS5.5) - Manual (Page 16)

This structure of a layer named “Layer” containing a clip called “Rocket Launch” could
easily be recreated in After Effects. You can imagine a comp called “Layer” and that
comp contains a layer named “Rocket Launch”. But this setup is a bit inconvenient in
After Effects, nested comps in After Effects-- while powerful-- can get in the way. So in
this example the Motion clip loses its layer-wrapping and becomes an After Effects
layer.
In cases where nesting needs to happen, it does. Imagine two clips in a Motion layer,
then the layer is rotated.
Visually this causes the two clips within the layer to rotate, so in After Effects we need to
have both layers rotate. The best way to convert this example is to create a nested
composition in After Effects and apply the rotation to the layer that represents the
nested comp.
Now youʼll see how Motion layer names will want to be changed if theyʼre going to be
created nested comps. “Layer” and “Layer 1” and so on just isnʼt useful, so be mindful of
that in Motion when youʼre setting up your project.
The nested comps from Motion are the result of a lot of complex calculating by Pro
Import AE. Nests in Motion donʼt actually have any size, they are simply the sum of all
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