You can choose to copy an animation layer using the Duplicate button, the context menu options, or the keyboard shortcuts.
To copy the animation layer using Duplicate:
The current layer displays bright green in the Animation Layer editor.
The newly-duplicated layers appear above the current layer in the stack and contain the keyframes of the layers you copied.
To copy and paste the using the context menu:
The pasted layers appear above the current layer and contain the keyframes of the layer you copied.
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