I recently downloaded the Facebook app from the App Store and finding my way around. As a Facebook newbie, can someone tell me how to play videos that are sent to me? I like to listen to them, even though I cannot see them. Also, when I interact with a post and get to the next page where voiceover says "Choose an action," I can use the like, share, and comment buttons. When I press the more button, I can hear the sound of the screen changing, but VO is silent. Running and tapping my finger all over the screen does nothing but beep and click. What am I doing wrong?