Originally Posted by filmgal
Works like a charm. As far as I can tell you can you only assign one file to 1 book (which is what I wanted anyway). Perhaps the drag & drop method into the open Edit Metadata window is best for a single book with multiple formats.
You can also select the book in the library and drop the file on the details pane. That adds that format to the entry or replaces the existing file if it is already there.