Hubspot's external embed code is supposed to be copy/paste and BAM - you're good. I can't get the code to work in OptinMonster's ad builder. The email form I am trying to add does not appear. (New to this so there is likely something I'm missing.)
<html>
<img src="xxxxxxxxxxx"/>
<!--[if lte IE 8]>
<script charset="utf-8" type="text/javascript" src="//js.hsforms.net/forms/v2-legacy.js"></script>
<![endif]-->
<script charset="utf-8" type="text/javascript" src="//js.hsforms.net/forms/v2.js"></script>
<script>
hbspt.forms.create({
portalId: '2786381',
formId: 'fdaf93fb-5e42-46bd-84fc-57156ce26d07'
});
</script>