You're currently unable to send postMessages via the vendor pixel UI without inputing an initialization script. While there are use cases for the way it's currently setup, not having this ability somewhat defeats the purpose of postMessage utilized for tagging, as often times you don't need any sort of script in the iframed quiz (script can exist on parent page, listen for postMessages from iframe, then fire as a parent page event)
Ideally you'd be able to check the "send to parent page" toggle and add events. Currently if you do this without a container script, you'll be unable to save/it thinks you're trying to delete mappings
