I'm working on my first fixed-layout EPUB. I'm using InDesign CC 2014 on my Mac book with OS X 10.9.5. Here's been my basic workflow so far:
Any ideas on what I need to do with the file so the options are active?
Moved to InDesign EPUB forum.
Radio buttons are not intended for this function. I suggest creating the buttons yourself and assigning the action to those.