Sorry, I'm not familiar with that option of adding a media url. I can't see it in the latest version of Zen Cart, perhaps it's linked to media manager or something. Others may know more.
The way I embed videos on to a product page is just to add the embed code to the Products Description field. The code would look 'something' like this:
Code:
<iframe class="youtube-video" title="NCBI embedded YouTube video player example" src="https://www.youtube.com/embed/xxxxxxx?list=xxxxxxxxxxxxxx&mute=1?html5=1&enablejsapi=1" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
Bookmarks