EPUB: What would cause this difference?

[Mike24743490uli6]

Attaching screenshots of a given chapter of a book; one in the Kindle app and one in the Apple Books app. In the Kindle, it shows both "Twenty-Two" above the title and then the number 22 prior to the chapter title. In Apple books, the numerical 22 isn't shown. Why would this be?

I'm trying to have the chapter numbers spelled out above the chapter title, but then in the TOC have the chapters numbered like:

1. [Chapter 1 title]

2. [Chapter 2 title]

This is a reflowable epub.

[James Gifford—NitroPress]

Are these from the same EPUB, or separate exports?

Don't auto-number the chapter headings in any way. Use auto-numbered TOC styles.

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[Mike24743490uli6]

Same epub file, different reading apps.

I've tried setting the TOC style to auto-number, but the TOC on the readers seems to ignore it. 

[James Gifford—NitroPress]

Hmm. I was sure I had accomplished something like that, but a quick test shows both Kindle Previewer and Thorium discard the TOC numbering.

The Apple reader is anomalous in many ways (vs. most EPUB readers and Kindle), so I am not surprised it shows the numbers when the others don't.

There are a lot of options including things like conditional text. I will tinker with it.

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[James Gifford—NitroPress · Accepted solution]

Well, my first six tricks didn't work. I am tempted to say it can't be done, at least not as a straightforward setup.

The only solution I see is (1) use no autonumbering at all and then (2) edit toc.xhtml in the exported EPUB. I try to avoid that kind of file surgery for many reasons but see no other easy solution.

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