I was able to view the video.
You cannot put PHP code in a wysiwyg. You cannot use a shortcode as an attribute of an html tag. In addition to this if you are attempting to use a shortcode then the ACF field must be attached to the same post as the content. If you want to use a file field and insert and iframe in a wysiwyg field then you will probably need to build your own shortcode to do it. Beyond this I’m not 100% sure what you are trying to do, or where the fields are, or how that location relates to the post where you are attempting to insert the iframe.
