i use the android app on Kindle Fire with sidloaded epubs., it seems to turn any sideloaded epub into kepub - in that it applies kepub style footers- page numnbers per chapter, not page numbers per book. When you import a book it is sucked into a kobo database sructure, it's no longer visible as an epub file if you search the tablet folders
there is a setting to toggle kobo formattting OFF, it then obeys the books own formatting rules. if you toggle it on, you get the extra spacing - traditional Kepub style.
there is one quirk that puzzles me - with a well formed cover.html file holding only the cover picture in <svg tags. you'd expect to see the cover as 1st page of book, but on the tablet you always get a blank page 1/2 then a cover page 2/2 on the tablet.
by well formed I mean that calibre polish or modify or convert has done insert /replace cover -
I wish that documentation/help was better. the latest tablet app lets you swipe to change font or to change brightness. I spent bout an hour trying different swipes - different directions, different areas of the screen...& could not figure how to predict whether font or brightness was going to change. Google eventually told the difference between a pinch and a 2 finger swipe - kobo don't explain that. I'd prefer anyway to disable both of those but there is no option.
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