I figured it out but will post the solution just in case anyone comes across this problem in the future.
I had organized my videos in the project in subfolders. For some reason, subfolders don't seem to work (though I'm curious why subfolders are a feature if the videos within the subfolder can't be accessed during runtime. I wonder if this is by design or a bug?
Ashley)
What I ended up doing after hours of trying to figure this out...
Now when I play the game, the videos play again.