The USB cable works well because it appears on the desktop of the Mac mini which is under high sierra. Concerning Kobo application it is the latest version on my MacBook under Catalina.
My Kobo may be too old for Catalina?
I have another issue with the Mac mini under high Sierra is that I can not send an ePub or kepub via calibre 3(calibre 4 is not compatible with high sierra).
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