How to display a gridfield with data offline

The interface for my grid field has all it's data queried before losing connection and stored in a local variable. Then for the grid field's data parameter, it's getting it from the local variable. I have this interface as a start form in a process model, so I may make it an Action on a site. When I test this out on mobile and disconnect myself it stops working. I followed the guide in Appian documentation not sure what I'm doing wrong? Is it because it's not a form, I even gave it a cancel button.