How can you upload ePub files to iConnect?
I'm trying to directly upload an ePub file to iConnect. Is this possible? How is it done?
iBook
I'm assuming you mean how to deliver your book to iTunes Connect for the iBooks Store using iTunes Producer?
Do you have an active iBooks account? If yes, you currently need iTunes Producer (mac only) to deliver your book.
Things may or may not change in the future, but for now you need a Mac and iTunes Producer.
Everything is pretty well documented and easy to find in their documentation Resources and Help.