First download this app
Now go to safari search YouTube.com and search for your commercial!
Copy the URL to your commercial!
When the app is downloaded,click on it.
In the music app. Search YouTube to mp3 and then paste your URL
When the video is converted, download!
Let it download
Click on the commercial you want
Click the bottom right button
Make video :D
Enjoy :D if you happen to make a commercial and it's on YouTube comment the URL please! :) I'd like to see it :)