I personally believe that the Disco bot is asking for a image… not a gif… (Which maybe make sense if Disco bot check if the file is a common image extension.)
Just BTW:
Disco bot is developed by discourse (the software that powers this forum). If you have any questions about discobot, ask on meta.discourse.org would get a precise answer.
BTW, it was discobot that suggested the gif. I did remove the quotes around it and the image embedded fine, but the "lesson" wouldn't pass, even after several attempts using the link.
I think perhaps we’ve set the “Trust level” required for embedding a link high enough that perhaps it interferes with the Discobot tutorial.
If you report the bug to Discourse would you mind sharing the link here? I’d be interested in following that to see if there’s something we should be changing in our Discourse settings to make this easier.
That might be part of the bug, though the instructions state:
"Try uploading that one next, or pasting the link in on a line by itself!" (emphasis mine)