Edited, this isn't going to work: see photo.
Thanks both of you. It's not exactly what I had in mind but looks like it would work. Since there are boldened chapters which should have converted to headings. I hope.
Going to try ePub split shortly. Given I can't get Atlantis to do what I want here I'm running out of programming options before I attempt reworking via PDF.
Yes it's massive, though not the largest I've seen, but it's not intended for general distribution. Electronically it's only going to a few people. It's not up set to be consumable at the moment.
Well, at the moment it's not set up to be anything since nothing portable loads it. Lol.
I know the length is what's tossing totalreader since it can handle files many times this size, so it needs to be split.
Nothing out there like HTML join and split, for ePubs?