Moving to InDesign EPUB forum
Unfortunately, not all epub readers are created equal.
If it works in iBooks, my guess is that this on the reader applications, not the file you created. You could also try publishing it to Publish Online where it should work if it was created properly.
Thanks for the quick reply!
Looks perfect online - so unfortunately does look like the reader applications not support this.
Don't suppose you know of any other method which doesn't involve epub, which allows me to use MSO's on iPads and Desktops.
Should work in Adobe Digital Editions though you might run into some other issues.