This method has a significant flaw: If you scaled, rotated, or moved the precomp layer in the main timeline, the pasted layers will revert to their original positions. You will have to re-apply those transforms to the newly pasted layers.
If you need to un-precompose while preserving position, scale, rotation, and effects, the native method falls short. This is why almost every professional motion designer uses scripts. how to un precompose in after effects
"Un-precomposing"—or bringing the contents of a nested composition back into the main timeline—is a common request. However, After Effects does not have a native "Un-Precompose" button in the Layer menu. This method has a significant flaw: If you
While After Effects lacks a built-in "Un-Precompose" button, you have options: you have options: