Hello!
I need to convert a book from epub format to fb2. Calibre does the job quite well with one exception. All the links to footnotes are gone after processing. Original epub contains a few dozens html inside. Each link in those html refers to another html from the epub, i. e. there are no external links. Example of such link:
<a id="filepos8243" href="dummy_split_041.html#filepos1154881" class="calibre9"><sup class="calibre27">note</sup></a>
(I guess, the epub-file itself was created with Calibre, but all my efforts to find the original file failed.)
After conversion the link turns into:
<sup>note</sup>
Besides I tried to convert it to other formats as well (to htmlz and zip). The result is OK, links are preserved. I'd be grateful for any ideas on how to fix it for the case of fb2.