Are footers and headers working?

Have a look at the book_pdfs → module, it is a fork of book_pdf. I did quite a bit of work on that, it offers header and footer.

https://www.drupal.org/project/book_pdfs →

with that said, the book_pdfs module would be a lot more useful if it was using the mpdf library instead of the dompdf library.

The dompdf library has some pretty bad limitations relating to tables that is why I made this issue to offer mpdf support:
✨ Add mpdf library support option and set it as the pdf library option Active

I haven't tested 3482273 likely needs work.

Otherwise for the book_pdf module, I believe I did start some work on footer in the book_pdf module also

  ✨ Book TOC (Table of Contents) Active

Please test out the merge request for book_pdf. Otherwise have a look at these possibilities with the book_pdfs module.

3443839 ✨ Book TOC (Table of Contents) Active fixes some very serious bugs relating to the book_pdf module caching issues, especially when pertaining to having multiple language support and when you use revisioning you'll want a new revision id to indicate that a PDF has to be re-generated otherwise you'll see stale cached incorrect versions of your PDF and also if you support more than one language this patch ensures the correct language of the PDF is consistently made available.