
When you want to click a specific thing on a slide to start an animation effect, use a trigger. Triggers give you specific click points for controlling animation, and are especially useful when you want several effects on a slide.
Trigger an animation effect to begin when you click it
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On the ANIMATIONS tab, in the Advanced Animation group, click Animation Pane.
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In the Animation Pane, select the animated shape or other object that you want to trigger to begin playing when you click it.
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In the Advanced Animation group, click Trigger, point to On Click of, and then, select the object.