Loading animation from external swf

Hello,

I'm doing a school project and I want to load an external swf with an frame by frame animation inside of it and then load it into a loader within a movieclip. I get no error messages when I test the code but the animation doesn't show up. It's just a black screen. I'm using the newest version of Animate and I'm on a Windows 10.

This is the code I use for calling the URL:

var tieURL:URLRequest = new URLRequest ("externalkillingme.swf");

var tieLoader:Loader= new Loader();

tieLoader.load(tieURL);

loader_mc.addChild(tieLoader);

Am I missing something?

Thank you.