haven't found a way to upload images into comments (or when editing a previously posted article either) only way I have found is when copying them from another already posted space. From what I have gathered (and I might be wrong) the only time you can actually "upload" an image from your hdd is when you are creating a post for the first time. other than that , the image needs to exist online somewhere... so that you can copy its link.

Hope that helps at least a little lol