ePub- Hyperlinks & file size

I have a Writer file, very hyperlink (headings/ figures/ tables) & illustration heavy. I’ve managed to compress figures and get the size down to 9.4Mb.

When I export to EPUB, all the hyperlinks to & from Contents to text are lost and the consequent file grows to 40Mb.


  1. Is there anything I can do to retain hyperlinks (essential for this book) and reduce the file size?

  2. When the file opens in Apple Books (Mac), it is much clearer than a pdf, but it appears on an A4 format, when it started as A5, and this appears to prevent magnification. How to keep as A5?