iframe embed code controls

While I am able to embed a youtube video into storyline, the controls are not visible. I have tested many methods (including the web object method) to no avail. My embed code looks like this:

<iframe width="854" height="480" src="//www.youtube.com/embed/Dbrlg1fEhbE?controls=1" frameborder="0" allowfullscreen></iframe>

Also, the YouTube logo is visible, despite what this article claims.

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