NOTE: The animation, movie, or sound plays in the order in which it appears on a slide. For example, if a slide is animated so that the previous slide dissolves into the slide containing the movie or sound, or if a custom animation effect is added to a movie or sound on the slide and it is set to appear before the movie or sound plays on the slide.
If an animation does not appear on the slide before you insert a movie or sound, then the movie or sound plays first, even if you apply a new animation to the slide later.
Click Automatically to make your sound or movie play when you show the slide. If there are other media effects on the slide, such as an animation, the sound or movie plays after that effect.
Click When Clicked to play your sound or movie when you click it. This setting is known as a trigger because you have to click something specific (as opposed to just clicking the slide) to play the sound or movie.
You can also make sounds and movies play across several slides or play repeatedly. Movies can even play full-screen.