Hey wonderful folks! Just wrapped up a simple one-time welcome modal which appears after signup.
Under the hood, it's using a tiny bit of custom code (Explained in the tutorial video) to show or hide an element based on a link parameter. If "welcome=" is present in the URL, then the element will appear.
You could adapt this code to do all kinds of things! On form submissions, on signup, on login, on logout, on button click, etc. etc. Anytime the page refreshing and you can set a new link param this code will fire.