Incrementing a Variable.
I know how to do this however I cannot save the expression I have built. Basically I want to increment a usage counter and then randomly show a pop-up.
I have created an interaction (on load) which set's the value of a variable + 1. I cannot save it because it displays an error saying I need an element that contains values.
Does this mean I have to store the value of variable to a hidden text box or label? I don't want to show the value. It will be used behind the scenes.
Any ideas please?