How use embed button with iframe/youtube code

Hi:

Thank You for this plugin.

Here’s code my client was trying to embed, which she’d gotten from youtube:
<iframe width=”560″ height=”315″ src=”//www.youtube.com/embed/AZ7nQW3igro?list=UUOn6jLGB0YEqTDHLhVc_7Uw” frameborder=”0″ allowfullscreen></iframe>

If I manually do a shortcode like this: [youtube id=AZ7nQW3igro?], using the letters/numbers/symbols following “embed” the video embeds and is responsive. Great!

But is it possible to use the embed button your plugin creates in the admin/editor to generate the shortcode? If I paste in the full iframe code as above I get a message window that says: No id

If I just paste the AZ7nQW3igro? I get the same message: No id.

It’s not clear to me via documentation what I’m supposed to paste where – make sense?

Thank You!

https://wordpress.org/plugins/advanced-responsive-video-embedder/