Step 1
Tap Manage Displays.

Step 2
Tap All Layouts.

Step 3
Tap the Layout name.

Step 4
Tap the pencil next to the studio file. Tap "Okay" on the popup message.

Step 5
Select an element to animate or adjust the animation.

Step 6
Tap the Animate button in the bottom toolbar, then click Animation Panel.

Step 7
You can now add or edit the animation.

Step 8
Tap Play to preview the animation. Tap once to stop the preview.

Step 9
Save and/or Publish when you're happy with the result. Ensure you publish to the same layout.