How can I insert an image directly into a post (that is, not only as an invisible attachment)? I tried to implement the instructions given in this forum (for example, to give an URL such as
http://www.online-literature.com/for...rum_new-48.png
(with added "img" before and after in brackets)
but it doesn´t work when I put in the URL address from my Dropbox account, neither with added "img" nor without. The only result is an error message "invalid file".