Hi   @brandiwoodson,
i went into Vimeo and used this link : https://vimeo.com/135025252 and with the share button click :
<iframe src="https://player.vimeo.com/video/135025252?h=e7702e49d3&color=43B02A" width="640" height="360" frameborder="0" allow="autoplay; fullscreen; picture-in-picture" allowfullscreen></iframe>
<p><a href="https://vimeo.com/135025252">Our Story - Nintex // Trade Creative</a> from <a href="https://vimeo.com/tradecreative">Trade Creative</a> on <a href="https://vimeo.com">Vimeo</a>.</p>

“Media Source” : https://player.vimeo.com/video/135025252?h=e7702e49d3&color=43B02A

used the src in the “Media Source” field an it worked. 
please try that and let us know.
Thanks,Majid

Aha! That did the trick - thanks!

You wouldn’t by chance know how to get a sharepoint library .mp4 file to work do ya?

Thanks @brandiwoodson glad that helped you :)

the SharePoint files ( .mp4) need to be shared - i guess for everyone. so i guess this will be part of “OneDrive” sharing ..try that ..first Share the .mp4 for “Everyone” and put the link and see how it goes

Yeah, not sure how to fetch shareable link from sharepoint library. I know it’s synced to OneDrive but no clue how to pull a file from OneDrive that sits in a sharepoint library. I tried document ID services link and links passed in workflow and no bueno.

But it does work when I paste the shareable link from sharepoint right into the default value of plugin control. 

Thats great if its working for you 

can you please try to “Log Out” from all your SharePoint sessions and close the browsers, then just open the NAC Form with the .mp4 video link and let us know if that still work.