As the instructions point out, all videos are fetched automatically and listed alphabetically. Most playback features are supported, but you can't fling a video to Chromecast or another Plex app yet and external subtitles aren't supported. (Worst of all, it won't remember where you left off if you exit the video. Ugh.) The app can play .MP4, .MKV, .AVI, .WMV and .WMD formats -- just note that the first time you play a video of that type, you'll need internet access for the app to update player support components. After that, watch offline to your heart's content.