Get your cohost iframes (chiframes even) here:
So it turns out cohost has a setting to disable link previews, and if you had it on, you wouldn't be able to see any of the chiframes. Fortunately, I was able to update the generator to account for this, so now if you see a chiframe while you have link previews off it will just say "You have link previews disabled." instead of showing the internal chiframe url. Unfortunately, this won't effect existing posts, if you want this fix in your posts that already have chiframes in them you will need to use the generator to get the updated version of the code.
i added a scale slider so you can make sure things don't get cut off if they're designed for larger-than-chost sizes
