Maintain URL Parameter Across Multiple Pages

Question

I have a portal that is reached by scanning a QR code and takes 1 url parameter and passes it into the initial page where the user can fill out some data. However, if the user navigates away from that page to another page on the portal, and then comes back, the rule input is blank and the url parameter has also been lost. Is there a way to save the user's data so they don't lose it when they navigate back, or at least a way to preserve the url parameter between pages so it can be passed back in to the form? 
 
 Thank you, 
 Jack

Jack Ferguson · Answer

Shivika, 
 No, I was not able to resolve this issue. While I was able to use the plugin I mentioned above (" Preserving the State of Navigation/Selection") successfully in the portal via a web API ( Harshit Bumb (Appyzie) I believe this is a new feature of 24.1 based on the release notes) there is no way to uniquely identify a user or portal instance in Appian currently. 
 A work around that should work, although I haven't implemented it yet, would be to have only one page on the portal containing one "master" interface with a rule input that the url parameter is passed into. Then create your own tab system within that interface to call sub-interfaces that can be passed that rule input.