Copy and paste objects from one frame to the next. To copy, select an object (click on it) and click on the Copy button. Choose which frame you want to paste onto and click the Paste button.
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Before you start on the beautiful details of your animation, try drawing a simple outline. This way, you can get the overall composition looking great, and you can make sure everything's going to fit in the frame! Once you're filling in the details, you can start deleting your outline if you don't need it any more.