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I'm creating ping ponging loops of frames to then draw on successive copies each forward-backward loop in a different way.

Looking for a few-keystroke simple way on the timeline to convert ping-pong or cycling images into editable images on the timeline (I know I can export the images as an avi or sequence and load them in again, but I'm hoping for something more automated.)

I create a new layer, extend its frame to the desired length, and merge with the ping pong layer.

That's Great! Thanks!