Forms' limitations

There are a few things we cannot achieve with FormApp. For example, there is no way to catch user response and modify a form according to their answers. The only form-related event that we can catch is the form submission itself; that is, we can catch the occurrence of an event when the form is submitted and all the data is already recorded. It's a major limitation of this service, but we'll see that it's possible to do so using other approaches.