Yes, you can now upload chapterized zip files when setting your audiobook up for direct sales. Log into your editor and go to Books > select the book you'd like to set up > above the book cover/description click the tab labeled 'Sell Direct' > click the '+ Audiobook' button > select the 'Choose File' button next to ZIP of MP3 chapters.
Can you upload zip files of chapters for the audiobooks?
Learn how to upload zip files of chapters for your audiobooks.