I'm having a weird one with epubs myself. I don't know if I missed a setting or something, but I can't send epubs over USB to my kindle in the newest calibre. I was using 5.1 and thought it might be some kinda leftover problem from using an older version, but even with the newest I still don't have an option to send epubs.
If it helps, I've got a kindle oasis.
Any idea what I'm missing? I can email the files perfectly fine, but USB transfers it just won't let me pick the epub format, and wants to convert them before sending them over.
Thanks in advance for any help!
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