There is an image icon in the edit bar
but, it just injects markdown into your code that needs the image URL. Nothing is uploaded. What should I do?
PS I have spotted that their Documentation/Create New Page contains an image with url https://sourceforge.net/p/forge/documentation/Create%20a%20New%20Project/attachment/uberproject-metadata.png. Please note the
<page name>/attachment/image subfolder. So, there should be a way to attach image files to your pages. But how? I do not see any button.