Step 1
Click the background image.

Step 2
Select the animation on the right.

Select the start time & duration.

Click the Play button to preview the animation.

Step 3
Click Advanced for more options.

In the Advanced animation controls, you can either use the Animate on and/or Animate off controls or the Animation builder.
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​Animate on/off

The "Animate on" feature adds an animation at the start as an entry animation, and the "Animate off" feature adds an animation at the end as an exit Animation. Animate on and Animate off should not be used for elements using the animation builder.

Animation builder
The Animation builder can be used to build multi-step animations. Animation builder will replace any basic animations you have for that element. Make sure to set each animation step to the time the last step ended.