The udemy site is great, but this app is awful. I use the app for one simple concept - to cast lectures to a chromecast to view on a big screen. It is a random chance whether or not the media actually plays. Googling the issue shows maybe there's some content restriction with some videos, but it's bizarre and unclear and random and inconsistent and ultimately rubbish. I'll stick to the site, but sadly I'll be using the platform less with this diminished accessibility.