Am trying to preview my epub in a viewer. I have downloaded Xcode only to save time so when my ebook is read i can do the proper process. Now when i do export it takes me to Application uploader which somehow doesn't accept my password.
Your subject line says DPS and the body of the question says EPUB. Until you
can clarify what's going on here nobody can help you.
You also mentioned downloading Xcode which has absolutely nothing to do with either the creation of DPS or of EPUB.
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