Did you get your questions answered in these other threads? The new User Specific columns will only work for a user until they close the app at the moment. Sounds like Glide plans to make it possible for public apps to retain values in the future. For right now, I can’t think of a good way to link a user to specific data without being a signed in user. Even though they can submit a username in a form, there is nothing to identify which device or actual user submitted that form.