I have basically followed the below guide from salesforce. It works fine apart from one thing. if the user hits the previous button in my flow they are greeted with the following error message! (The delimiter of "StageVariable" stage is missing.) I really like the stage progress bar but i don't think i can keep it if the user can't return to the previous screen :(
I have followed this guide and made no amends.
In my flow i have created stage variables for each screen then I'm doing doing an assignment before each screen to set the current stage. This is working fine when going through the flow with the next button.