How do I make a video start automatically when open it up in a new browser window?

Thanks for looking further into this, Katie! 

I viewed your examples. In your first example  (i.e. video is set to Play video: when clicked, but the video plays automatically in your browser), the video does not play automatically in mine. Then it has to do something with the setting of my browser like you say, and as I cannot control learners' browser settings, I have to go with option 2.  And that is what I have implemented already.

It is not a problem for me if it is set to Play video: when clicked, as long as the audio is in sync. So just thinking now, maybe I should (for my next project...) do all the pre-work of videos in Replay (i.e. add text-to-speech to my video) and then import the final video to Storyline. Or will this additional modifying in another Articulate product decrease the quality of the mp4 file?