I’m hoping to use my principle prototype for some user testing shortly,
and would love the ability to link off to another URL for them to answer some questions.
I cant find any documentation on how to make this happen?
Is this something that can be added? 
It’s not available just yet. But you could do a workaround where onTap, it just open up the browser view with the client’s site but it’s designed UI, and not the actual site.
I made a whole project, where I simulated a whole phone waking up, getting a notification, launching the app and so on.