hey steven
thanks for the reply and for trying to troubleshoot this
i guess i wasn't clear: i'm not even seeing the 'expand' button in the juicebox builder app, which has no option for embedding / iframe within it. And no, when i publish a standalone html page, there is no embed option there either.
i expect that if i can get it to work in the builder app, that it will get us closer to getting it to work on published juiceboxes (is that what you call them?)
as always, thanks for trying to help me to use your product