Tiny video and no autoplay

Hi, I just installed the plugin and used the standard HTML code option just to see how it works, and it’s showing a very tiny thumbnail of the video and also isn’t autoplaying.

I saw in other threads that the tiny video issue is due to caching, but I only just installed it 5 minutes ago. The CSS options also don’t make a difference.

I also noticed that autoplaying can be ‘fixed’ with mute=”1″, which is true, but it obviously also mutes the video. Sound is fairly important. Other video popup plugins autoplay by default, is there a reason this one won’t?