Vexnar

So, I just got LaunchBox and Big Box today, and I just starting building my collection of classic games. One thing I'm determined to do is add intro videos to specific systems as their system start ups, to symbolize turning on a console and starting it up. Some of them are directly lifted from the console, while others are modified or fan made. Basically, I'm asking, how do I add console specific intro videos to BigBox? Searching for this specific topic has been kind of difficult, so this is pretty much my last resort. Been trying to add one to the videos, but so far, it's not working.