Embedable Media Card doesn't match how it looks within Twitter


Hey, we have a custom media card that plays video highlight reels and while it works fine within Twitter:


When we embed it in a website, the media content is invisible (click on the Instant Highlights tab):

Any ideas what is causing this?



The video is showing up just fine for me. Are you using a specific browser?


I am using Firefox on Windows 8. I can also confirm that Chrome on MacOS shows the video.