Scrub the timeline
Scrubbing refers to manually scrolling through an animation, forward and backward, previewing your animation, pausing where you like in case you want to add a keyframe.
To scrub the timeline
Select the timeline from the Storyboard picker by clicking the Open a Storyboard button
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under Objects and Timeline and then selecting a storyboard.Click and drag the playhead
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as you want, forward or backward.As you drag the playhead, you will see the animation play out on the artboard.