It possible to get the galley URL and set it on a iframe on article_details?

Hello, I’ve been trying to add an iframe to the archive “article_details.tpl” The intention it’s that it shows/displays the supplementary galley (HTML) I’ve previously uploaded.

I’ve been doing some trials adding the ‘iframe’ to the archive

But as you can spect, when I do this, ALL the articles will have the same iframe on them and obviously the same video. I need that this iframe “adapts” to each of them…

The problem is that I can’t find a proper URL/path that can be placed in the ‘src’ of the iframe in the main archive that helps me with this.
I was wondering where’s the function that generates the link and if there’s a proper way to implement it for this kind of use.

I wish I could implement plugins, but unfortunately, I can’t add them to the site because of the php.ini configuration and the refusal y of my hosting to modify it …

There is an archive called ‘galley_link.tpl’… but I can’t figure out how to ‘call’ the function, or even if this is the one that I’m looking for.

Thanks in advice.

I’m using OJS 3.3.0-14