I have a stand-alone HTML test image sequence working great:
https://www.footlevelers.com/lp/2022/flp_campaign/index_v2.php
When you visit that page, you'll need to scroll down to see the animation as you scroll.
When I try to add just the animation section to an SP PageBuilder page, it's broken in various ways. On the SP page, I need to add a background image (which you can see on the second link... it is a very faint pattern). You can see what I have here (https://www.footlevelers.com/component/sppagebuilder/page/719?zpStyle=flop). But the rows/sections below the animation won't stay "stuck". I've been able to keep it stuck by changing the "overflow X" values on the section, but then the animation doesn't play (as the SP page I shared shows)... The animation stays at frame 1 for some reason.
I'm getting no errors in the console, so am unsure what's causing the problem.
If you all can use my code in the first link to get it working on an SP PageBuilder page with a section before and after, please let me know what I need to do.