Adobe Animate CC Help with Video

I'm doing a project for school and I need to include a video. Whenever I test the movie in Animate and press the play button, there's always a white screen that shows before the video plays. Also, the video will play when I test the movie in Animate, but it's doesn't play when I test it in browser. Will someone please help me with this.

Here is a link to the video of what's going on:

Adobe Animate CC Help with Video on Vimeo

The video format is mp4

Here is the action:

import flash.events.MouseEvent;

playbutton.addEventListener(MouseEvent.CLICK, video1);

function video1(event:MouseEvent):void {

gotoAndPlay(242)

}