Ctrl + S (Cmd + S on Mac): Save changes to your current popup.
Ctrl + Z (Cmd + Z on Mac): Undo your last action.
Ctrl + Y (Cmd + Y on Mac): Redo an action that you've undone.
Ctrl + C (Cmd + C on Mac): Copy selected elements.
Ctrl + X (Cmd + X on Mac): Cut selected elements.
Ctrl + V (Cmd + V on Mac): Paste copied or cut elements.
Delete or Backspace: Delete selected elements.
Ctrl + D (Cmd + D on Mac): Duplicate selected elements.