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The best format to upload to Amazon is oddly epub2 (not so odd really as AZW/KF8 is a sort of proprietary version of it).
Amazon then offer customers a mobi, azw or kfx download depending on if you use "Whispernet" or "Download to PC and transfer via USB". Also depends on which eink model/firmware you have or if a Fire or if an App (iOS, Android, MacOS and Windows may differ slightly?).
KFX is ONLY a delivery format and a NASTY one as it adds DRM even when publisher requests DRM free. If a customer has an eink Kindle currently they are best to avoid it by using ""Download to PC and transfer via USB" aka sideload. They they can also have a backup that doesn't rely on the Amazon Cloud or the Internet.
Create an epub2 that passes epub check for all the non-Amazon stores and upload that exact file to Amazon KDP.
I'm curious, why do you want a scroll instead of a codex? Personally what I love about real ebooks is the autoflowed to fit screen pagination vs endless scroll of a webpage. I'd love a pagination plug-in to make my laptop browser and tablet browser like the prehistoric Kindle DXG browser, which paginates. Also scrolling is VERY poor on eink compared to paging set to refresh every page.
Maybe if scrolling is very important you should distribute as HTML.
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