This is not a huge issue but it would be great if it could be addressed. I do podcasting and am using Fireside as the podcast host which is one of the most popular providers of podcast hosting. Unfortunately, when I post a link to expand it gets heavily cropped.
Here is an example of what it does when posting an episode link for expansion: (I put the wrong episode in this screenshot, ignore that part lol)
I am referring to posting a link and it expanding correctly or expanding to an iframe of that episode (like YouTube) not just posting an iframe.
For example, if I use wellfed (rss polling), ifttt, wordpress plugin, or something else to auto post a topic it wont have the iframe as an option to post just the itemurl. This is why I was asking about the expansion portion not just an iframe post.