I've used "generic" output profile and (using an iPad) I've used the iPad output profile. No difference.
As info, I loaded the output ePub file to Sigil and checked it and it reported "No Problems" with the ePub file.
I'm a novice at actually looking at ePub code but here is what I think is the cover code, - - it looks the the cover is being set to 640x450 (generic output set):
Quote:
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" height="100%" preserveAspectRatio="none" version="1.1" viewBox="0 0 450 640" width="100%">
<image height="640" width="450" xlink:href="../Images/cover.jpeg"></image>
</svg>
|