By default, when you duplicate a composition in After Effects ( Ctrl+D or Cmd+D ), you create a duplicate, but the layers inside still reference the original footage and pre-comps. If you change one, the other changes. This is called instance duplication .
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After testing the free trial, most professionals purchase the license. Here is why the paid version of True Comp Duplicator is worth skipping the "free download" search: By default, when you duplicate a composition in