In addition to (or repitition of) the above, I have found that only the big
red "Reply" button or "
Quote" work to get the paper clip icon.
I will usually click on the big
red "Reply" button or "
Quote" before actually typing in what I want to before adding images.
While when you go to add pictures, it will say that the file size can be up to 5MB, however, the fact of the matter is that they
need to be less than 2MB.