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Replacing source footage globally by dragging in the Project window


    When working on a project, you may want to replace the source for a layer with another item that is in the Project window and, subsequently, have the new source appear in all the compositions that use the replaced (old) source. In After Effects 5.5, you can replace every instance of a layer's source by dragging within the Project window. To perform this global replacement, hold down Alt (Windows) or Option (Mac OS) as you drag the new item in the Project window to the item you want it to replace.