To duplicate selected layers, choose Edit > Duplicate or press Ctrl+D (Windows) or Command+D (Mac OS).
How do you duplicate a layer?
Duplicate a layer within an image To duplicate and rename the layer, choose Layer > Duplicate Layer, or choose Duplicate Layer from the Layers panel More menu. To duplicate without naming, select the layer and drag it to the New Layer button in the Layers panel.
How do you duplicate a layer in After Effects without changing original?
You just need to select a comp based layer from the timeline, press Ctrl/Cmd+Alt+D to duplicate a layer and it’s inner hierarchy. Cheers!.