Upload an image to use in a template. It is stored on the image server without access check, as e-mail clients fetch it, and the response gives its public URL; the editor puts an <img> for it in at the cursor. An e-mail carrying a password, code or login link only loads images from the image server, www.telecomx.dk and Google Fonts (see secrets), so images for the layout and for those e-mails must be uploaded here.