By clicking Test Action, an email will sent to the sample data you were using from Shopify. In this email, the video will not be embedded. This is because Zapier has the value "generating" for the video link & thumbnail. These are placeholder values meant to set up the app. In practice, once the Zap is triggered, BHuman will take a few minutes to generate the video, and return that video to Zapier. Zapier will wait until this is done before continuing. So, even if your video does not look embedded in the test email, it will be in practice.