Export OAM to use in InDesign FL-EPUB

I have made a slideshow in Hype 3 Pro to export as an OAM widget to use in InDesign. The ultimate product is a fixed layout ePub, to be readable on iOS, Android and PC desktops. I have been able to export the OAM widget and successfully import it into InDesign. It appears to work well both in the ePub interactivity preview, as well when the exported ePUB file is read with Readium. So far, so good…

What I am try to do have a way for the widget to be stretched into full screen by the user. I suspect that this might be a limitation of InDesign or is there something I do in Hype to allow this?

Thanks in advance for any help.
Bob

There is a property that allows you to resize a widget within Indesign itself, but I don’t think there’s a way for the reader to adjust that size unfortunately.