PRC vs .doc etc.
(I have similar problem of cover image not filling the screen on the kdp provided previewer.)
I used MobiCreator for conversion, and the cover/book both looked fine. I then uploaded MobiCreator's .prc file to kdp. (The book text looks fine in the previewer.)
My question is: Does it matter which type of file I upload to kdp?
Would there be any difference if I uploaded my .doc file directly to kdp and went through the conversion process there?
Or should I save my .doc file to web page filtered?
Or can I stick to prc?
Any advice appreciated.
PS (I don't know how to edit html.)