The scroll effects are not supported on OAM files (as far as I know for now)... I hope you can find another solution for this!
Thank you for your answer, but... how about this tutorial?
(Scroll down the page, to the title "Adding scroll effects to animations")
I've seen in other forums or pages other people also talking about this.
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That is indeed added to an OAM package, but that package was made in Adobe Edge Animate and not in Adobe Animate. Adobe Animate doesn't support it yet. And, Adobe Edge Animate still works, but will not be developed further, unfortunately.