HOW TO Add dynamic backgrounds on your iPad
1 Using an iPad
If you’re using Keynote on an iPad, dynamic backgrounds work in a very similar way to using Keynote on a Mac. Tap on the background of a slide, and then click the brush icon to see the formatting tools in a pop-up window.
2 The backgrounds
In the window that appears, tap on the Background option, and then select the Dynamic tab as shown. Choose a background from the picker at the top; swipe the options right and left to cycle through them.
3 Select multiple slides
To select every slide, tap the currently highlighted one and choose Select All from the contextual menu. You can then add a dynamic background to the whole presentation at once instead of slide by slide.