Quote:
Originally Posted by kgjones
(because ppl seem to be arguing what is the best/only format to use)
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There is no such thing as the "best" or "only" format to use when producing an ebook. Each and every reader (hardware or software, doesn't matter) has different requirements and implementations of the various file format standards. This is not just a case of differing versions, this is more like the "browser wars" of a decade ago - when IE, Firefox, Opera, etc all had different standards which required custom programming to satisfy the needs for each. As a generalization, and vast over-simplification, EPUB and MOBI will probably meet most of your reader's needs, but that will not satisfy all of them. Even if it does there are vast differences between what two different readers will display just in those two formats. The K.I.S.S. rule applies. Not because "you can't do that" (which is true enough) but because otherwise you're going to lose your mind trying to find the "perfect" display - which is absolutely impossible. Almost
everything you do will break on someone else's reader. Honest. There are lots of authors who've gone through this same issue and they've all simplified their expectations. Ebooks are reflowable - exact layout/display is impossible.
I cannot comment on the rest of the issues as I've never tried KDP. But I think the message you're seeing is vaguely familiar. More than likely the problem is the use of a certain keyword/mark-up that isn't supported. Hopefully some other user will stop by and give you a better/more direct answer to your problem with KDP.
In the meantime, you might want to search the forum for other topics with "publish" and "KDP" within the message. This might shed some light on the issue and make you aware of any others.
Edit: For instance, take a look at this topic:
Using Calibre to format Kindle books