Use the selection tool to select a part of the drawing. Choose to cut or duplicate the selection. After that, you can paste the part of drawing on the current frame or other frames.
While pasting on the drawing, you can flip the image.
Left to right: cut, duplicate, paste, flip horizontally, flip vertically
Please tap "the Paste" button to paste the drawing after fishing the editing. If you tap other buttons before pasting the drawings, the drawings will be removed from the canvas.