Full Screen video option in Articulate Storyline

The Storyline (flash) video player doesn't have an option to enter full screen mode.  However, if you publish for html5, you can alter the /mobile/player.css file to make the full screen button show up. If you remove the bold text, the html5 video player will be able to enter full screen.  

On or near line 687 of "[your output folder]/mobile/player.css.  

video::-webkit-media-controls-volume-slider-container, video::-webkit-media-controls-volume-slider, video::-webkit-media-controls-fullscreen-button, video::-webkit-media-controls-mute-button
{
  display:none;
}

Since this is a custom change after you publish, you will need to make sure that you make the change every time you publish. (or at the very least, before you hand off the finished product)