Upload to KDP

My book is now almost finished.....thanks to all on this forum who have helped along the way.

I have some questions on the upload to KDP process.

1. When I convert the .epub file to .mobi using kindlegen ( to proof the book on a kindle) I get the message

'Info(prcgen):I1052: Kindle support cover images but does not support cover HTML. Hence using the cover image specified and suppressing cover HTML in content. URL: /var/folders/n0/ds9ndtc91b1_x33byqs4v2qh0000gn/T/mobi-LasF7g/OEBPS/Text/cover.xhtml

As the upload process asks for a cover image in a step separate to the upload of the book file, I though I would just delete the cover.xhtml from the final draft before uploading, so no there would be problem with cover html or possibility of two covers...is this the correct approach?

2. There is also a message from Kindlegen

'Info(pagemap):I8000: No Page map found in the book

Is this important? What is a page map?

3. KDP gives the option of uploading as a .epub or .mobi file. Is there any advantage to using one or the other?

Peter