You may wish to check out this site, one that I used for my second book:
https://www.draft2digital.com/
You may wish to start a thread on a specific aspect of writing/publishing, rather than continuing a discussion here in the
Promotion Forum. That other forum is located here:
https://www.mobileread.com/forums/forumdisplay.php?f=75
No promotion whatsoever is allowed outside of the Self-Promotions Forum.
As well, you may wish to look over the
Posting Guidelines. Go to the very bottom of the page you are on and you'll find the button.
Good luck with your writing.