Nick, the title of the TOC (like “Contents”) that InDesign generates when it creates a TOC is a weird duck, and this weirdness persists through InDesign CC.
InDesign ignores the fact that you applied a paragraph style to it that’s supposed to split the EPUB. It won’t do it.
I need to write a blog post about this, but the solution is:
1. In your TOC style, clear out the text in the “Title” field at the top. You don’t want InDesign to add a title to the TOC. (There should be an option for “No Title” but there isn’t.)
2. Along with the other paragraph styles, include the paragraph style you’ll be applying to your manual TOC title (step 4) in the TOC style.
3. Save the TOC style and place/update it in your layout. There should be no title at the top.
4. After you place the TOC, add a text frame above it an enter the title of the TOC (“Contents”) manually, and apply your style to it that will split the EPUB. Make sure the left edge of your Contents text frame is aligned with the left edge of your TOC text frame so they export in the correct order.
5. When you export to EPUB, specify that TOC style in the dialog box.
The end result should be:
1. The title of your html TOC (the one at the front of the book) should appear in the navigation/device TOC, making it easier for readers to jump to it.
2. The title of the html TOC should appear at the top of the TOC page … iow the “split epub” attribute worked.
AM