I am uploading new book in KDP (on Bookshelf). It gives an option to continue with pdf or to "Have another format"
I've done several books that it keeps the pdf exactly as converted (the finished books are exactly as the pdf.
Yet, with this last book it keeps wanting to convert it to a scrambled kdp version.
I don't know how-to have it keep the same pdf format on this upload/conversion to a kindlebook.
PDF's are for paperback and you would be very wise to do it at CreateSpace (also Amazon).
For a digital Kindle book, upload at least a Word.doc - NOT a PDF.