Option to always start prototypes from the same page/frame

Prototype links get shared around by various people. Sometimes links are shared from a mid-point of a prototype by copying the url out of the address bar. This is useful for directing to a specific point of the user experience.

I’d also like a share option that forces everyone to start from the same page so they are experiencing the full flow instead of jumping into a mid-point if someone unintentionally (or intentionally) shares a different url.