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Yeah, if you just load normal epubs it defaults to an old version of Adobe Digital Editions unfortunately.

Yes, though I understand Kobo is working on correcting these issues with the epub format.

Are they? Where have you heard that?

Recently Calibre was updated to convert things to kepub when loading to Kobo devices - see https://www.omgubuntu.co.uk/2025/03/calibre-update-convert-k... - but I haven't anything about Kobo itself doing anything to improve this.