Some sample of triggering options

By checking this option, the animation plays when the page loads as well as when you scroll up to the object and it enters the page. So it is not playing unless it is entering from top, to test:

Scroll down and after object is out of the screen, scroll up back to it and its animation plays.

By checking this option, the animation plays only when you scroll down and the object enters the page from the bottom of the screen

These are some sample of different triggering setups to show you how customization of the triggering will work

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