Embeded video from S3

We use Amazon's S3 to store our content. I'd like to iframe a video stored on S3 via a link. I can add the embedded link but it shows up like the attachment. When clicking on read more it opens the video in a new page and plays.  

I've tried using an iframe code but it says it's not a valid url. Just putting the url in the embedded option renders the "read more". Any way to get this working? It is a valid url with https.

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