Hi Robert,
Thank you for digging that out for me. So yes, there there is specific code for it in Discourse. It’s not something I need to do on my site as such. That answers that part. So if I want my site supported in the same way as Bandcamp on Discourse (and potentially other forums), I’ll need to ask or contribute the code to make it work for mine too.
My site’s not RoR but I do know some ruby so I might be able to contribute.
I have a 2nd question too. As well as pasting the URL, I also attempted to add the embed with the iframe tag. This works fine on a normal website but doing it on my discourse forum doesn’t work. A square box appeared but not the embed inside. I presumed it was a permission issue so I added my host to the allowed iframes but it still doesn’t work.
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OK so just as I was about to get a screenshot to show it not working it seems to have started working! So I wonder if there is some kind of delay in the system for applying the allowed hosts.
I’ll explore further. Thanks for your help so far.