Video menu not showing up on mobile device: You may need to use the option "Request Desktop Site" located in your mobile browser.

Video not auto-playing (desktop or mobile): Press the play/pause button or press on the video area for touch screen. (Sometimes the play button shows up as pause.)

Playlist not showing up: Press the playlist button (third from the left)

Looking for the Full Screen Button: Make sure that you collapse the playlist menu. You should find the Fullscreen button on the lower right corner of the video.