We have a technical issue where epubs with the apostrophe symbol(s) in their file names cannot be uploaded. They stop at 100% on upload and just freeze there.
So, if your epub file name is "You're Mine" It's best to rename it to "Youre mine" (on your computer) without the quotes, of course, before uploading on OkadaBooks.
This is not related to the Book title on Okadabooks. This only applies to the name of epubs being uploaded (not created) on OkadaBooks. Be awesome