[slowsmile]

From what both JPHowell and Hitch have said, if you upload a KPF file it will either be converted to KFX or MOBI7 -- which will only work properly on the more recent ET-enabled KF8 devices and on the older MOBI7 devices. And older KF8 devices that do not have ET capability will just receive the MOBI7 version.

So here's another interesting question. So what if you upload an image-dense KPF as a reflowable ebook(KFX) and a person buys your ebook who has an older KF8 device without ET capability. He will get the MOBI7 version, right? Which means that all the images from your ebook on that person's KF8 device will look utterly crappy(images probably way too large!). So he complains on your product page or complains directly to Amazon, who then send you a KQN about those crappy images in your ebook. I mean what can you do about that, particularly when it isn't really your fault -- it's really Amazon's fault for causing that incompatibility in the first place? That's why I think many people who produce image-dense ebooks using KPF format will be getting KQNs. And I doubt if many of those indie publishers with that problem will know what to do to fix it because this problem and its solution aren't documented or mentioned anywhere in the current Kindle docs as far as I know.