How to get the Play Music Button to work in a Published .swf file?

I am new to Adobe Animate and AS3. And I am trying to create a button that plays music in a .swf file. I have already created two buttons: one that stops my music. and one that plays it. The code I used is below. It works in the test in Animate but does not work in Published .swf file. I would appreciate if you could tell me how to get it to work for .swf file? The stop button works fine in .swf. Final question - is there a way to get buttons to work in a .GIF?

This is the code that I am using for my buttons to stop and play music:

var mySound:Sound = new Sound();

var myURL:URLRequest = new URLRequest("audio_hero_Separate-Ways_SIPML_C-1317.mp3");

mySound.load(myURL);

music_btn.addEventListener(MouseEvent.CLICK, playSound);

stop_btn.addEventListener(MouseEvent.CLICK, beQuiet);

function playSound(e:MouseEvent):void

{

mySound.play();

}

function beQuiet(e:MouseEvent):void

{

     SoundMixer.stopAll();

}