Captivate 9: Interactions

I’m fairly new to this product, but I’m wondering if there’s a way to ensure users scroll to the bottom of a PDF BEFORE they can proceed to the next slide. I’ve tried everything but I’m not sure if it can even be done here, if that’s a PDF edit or even beyond that. What little I could find in research mentioned a Javascript, but again, I’m not sure if that’s definite or not. I appreciate ANY help or guidance.