Click on ‘Add file’ and a pop-up will appear where you can add the file name and URL. Next, you should choose the file scope; outside form dialog, inside form dialog or both.
Outside form dialog only
In this case, the external script only has access to the page where the form is loaded. You could, for example, trigger or collect something based on certain information on the website.
Inside form dialog only
In this case, you can change the form with the external script, but it is not possible to collect data from the website.
Outside and inside form dialog
In this case, both outside and inside form dialog options are possible.