I write under several pen names and publish under different imprints. Can BookyAI keep more than one author bio, photo and publisher logo?

Yes, from version 1.9.6. Open the Authors page in the sidebar. Each profile holds a pen name, a bio, an author photo, a publisher name, a publisher logo and a legal notice. Create one profile per pen name or imprint; you can also duplicate an existing profile as a starting point. When you create or import a book, pick the profile in the "Author & publisher" selector, and change it any time in the book's workspace under Book details. The exported book takes its copyright page, publisher logo and About the Author page from the book's profile. If you had filled in the author and publisher settings before, they became your first profile automatically, so nothing was lost.