Okay, this is a pretty clunky and annoying way of doing it, but since the normal way isn't working, here we go:
See the bar of icons just above your text when you are writing? 15 icons from the left is the image one. Unfortunately you can't just upload the file this way, and you'll have to use something like Dropbox to get the image URL. It should work then. I don't know why the normal way isn't working, but I suspect it has something to do with the poll function (I think it messes things up a lot).
Hope this works.
See the bar of icons just above your text when you are writing? 15 icons from the left is the image one. Unfortunately you can't just upload the file this way, and you'll have to use something like Dropbox to get the image URL. It should work then. I don't know why the normal way isn't working, but I suspect it has something to do with the poll function (I think it messes things up a lot).
Hope this works.