I've attempted to use Skybox on my Pixel 2 XL using the new Daydream View. I've downloaded a movie I purchased from the Amazon app and another from the Vudu app. Both movie's download as .mp4 files but are not visible by the Skybox app in Daydream mode. However using a file explorer app, the movie's are shown as being stored on the phone.
I also downloaded the same movies onto my Surface Book using the PC Client of Skybox and the movies do not stream to the Skybox app in Daydream mode. My phone and my PC do connect with each other and the files do show up on the Android app, but they do not play (Stream) and display an error message.
Any ideas as to why I'm having difficulty watching movies in your app? Do the movies have to be VR versions (is there even such a thing?) or 3D? What am I missing?