I can't find my movies anymore

I have an external hard drive full of movies. It used to work seamlessly with iTunes. I could then watch all my movies in the other room on my Apple TV using the "computer" app. Now, I can't access any of those movies from the Apple TV. They are all loaded to the TV app on my Mac which is connected to the hard drive. But when I open the TV app on the Apple TV, I don't see any of the movies. Any help is appreciated!