I would like to know how can I make the image upload option available in the text editor inside the messages area (that option of bulk messaging accessible through the Participants list). I know that a similar issue has been already discussed, but the presented solution (in https://moodle.org/mod/forum/discuss.php?d=209991) didn't fit to me, because the code of this page doesn't use the mform, so I'm a little lost how I can get the same result in this case.
Below there's a print of my page. As you can see, it only displays the option to add an image providing an URL
Thank you in advance!