Quote:
Originally Posted by DNSB
Once the series information is written to the database, a Kobo ereader will sort on series regardless of epub or kepub. As near as I can tell, this information is not part of the kepub itself.
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You have a chicken-and-egg issue here: How does the series information get into the database to begin with?
With KEPUBs, it comes from a proprietary extension Kobo has made to the EPUB format and is found in the KEPUB file. With standard EPUBs, the only way to add that is by “cheating” with software (like calibre) which directly inserts that into the reader’s database, and that’s not something Kobo can reasonably be expected to support.