This option will help you see which layers came from the pre-comp. Whatever you put into this textbox will be added to the beginning of each layer that is un-precomposed. If no prefix is desired, just leave the box empty.
Copy Pre-Comp attributes to layers (Note on this option in the next section)
If you have key frames, effects, etc. applied to your pre-comp and want those attribute to be maintained, select this option. Each layer inside will then receive the effects from its parent and will be made a child of a null object that contains the transform attributes. The null object will have the name ||CONTROLLER||.
Discard Pre-Comp Attributes
This option will get rid of any attributes that are applied to your pre-comp. Layers inside the pre-comp will maintain their current positions and attributes. You may notice a change in position if your pre- comp is a different resolution then its parent composition.
Delete Source After Un-PreComposing
If this option is selected, once the pre-comp has been un-precomposed, it will be deleted from the project. This option will not be available if the pre-comp is being used elsewhere in the project. This option will be disabled if the 'Keep Pre-Comp in Composition' option is selected.
Keep Pre-Comp in Composition
If this option is selected, the pre-comp will remain in the parent composition after the Un-PreCompose has taken place. The pre-comp will be turned off, but still be a part of the composition. This option will be disabled if the 'Delete Source After Un-PreComposing' option is checked.
Notes on 'Copy Pre-Comp Attributes to Layers'
1) Masks are NOT copied
For the moment, masks applied to your pre-comp will not be copied over to the extracted layers. This may change in the future, so keep a look out for any updates to the plug-in
2) Particle Layers
If your pre-comp is a 3D layer that contains particle layers, you may get some issues on running the plug-in. Particle layers are usually meant to be applied to 2D layers, but if the parent comp is 3D, every layer inside will be changed to a 3D layer, so you might get some strange results.
3) Creation of Controller Layer
For now, the, any transform attributes of the pre-comp are applied to the null object, which then becomes the parent of each extracted layer. If a layer already has a parent, that layer will not be affected.