Iframe External Page

As always, love the simplicity of use of your plugins:)

I have followed the “Using IFrame” instructions and used example code at https://lightbox.tipsandtricks-hq.com/wp-content/uploads/video-lightbox-doc/wp-video-lightbox-plugin-usage-instructions.pdf

Does not work. Have example code exactly like this on page and opens link but not in lightbox:

<a href="https://en.m.wikipedia.org/wiki/Dialog_box?iframe=true&width=800&height=500" rel="wpvideo-lightbox">WikiPedia</a>

BTW: PDF instructions mistake or not [iframe] in the url?

Tried as quick test the inline example and it works fine.

Thanks in advance for your assistance.