[Stolen]

Would really appreciate some help with this.

I'm producing a massive .mobi for a friend of mine and it's doing my head in.

We're already distributing a PDF and EPUB built in Indesign and exported from there. I edited the EPUB by hand and we're all happy with the result, it validates and works perfectly (some formatting I'd like to clean up but frankly I've moved on).

This EPUB is huge and has a functioning TOC that incorporates at least 40 to 50 items.

I've tried converting this EPUB using a variety of methods to get the best result, including by Kindle Preview / Kindlegen, uploading the EPUB to Amazon KDP and allowing it to process the file which I downloaded and checked, and by converting the EPUB via Calibre.

However, now matter what version I check out I get the same problem. The MOBI has a functioning smart TOC on Kindle devices, in Adobe Digital Editions, and in Calibre BUT when I use the iPhone to checkout the MOBI there's no TOC. I'd be happy to gloss over this fact except that the book is HUGE and broken into quite necessary sections. Without a working TOC, I'm screwed.

Does anybody have any suggestions? I'm at a loss.

In the MOBI7 file there is a well structured .ncx but this isn't linked in the .opf under guide and I'm wondering if that might be an issue. If this is, what code do I need to place to link the two files together and then what can I use to compress the MOBI again. I keep seeing MOBI unpack but I've no idea how to combine the split files into a function MOBI.

I've provided an upload of the .ncx and .opf if anybody cares to take a look and I'm happy to upload the MOBI file if people can help out.

Thanks everyone.