Originally Posted by kovidgoyal
the level 2 expression only matches if a leve1 expression matched in the same html file.
I was afraid that the splitting might be the reason.
Is there a way to have calibre merge the html files again?
Why are you forcing use of auto generated toc twice anyway?
Because it took several iterations until I had figured out how to create the TOC the way I wanted and I also overlooked some headings in my first attempt.