Show next button only when all Button Sets are visited
Hello, I want to show the Next button ONLY when user have answered all four questions. I am using button sets so user can select only one answer per question. Based on user's answers, I am setting up variables. I tried to create a trigger where Next button is showed when the timeline starts and all the variables are non-blank (to make sure all questions have been answered) but this is not working.
I can also use multiple variables to check whether user went through all the questions or not but it is too much work and seems unintuitive to me. Also, there are many more similar slides and if all of them requires similar treatment, that would be a hassle. Any ideas?
Thanks in advance.