we have a multi-journal installation of OJS 220.127.116.11
For the journal pages, we use the option to upload a homepage image, then check the box that this image is used as header background. This works fine.
For layout consistency, I would also like to do this for the startpage of the multi-journal installation. The check box is there in Administration / Site Settings / Appearance / Theme, but there is no place where I can upload a homepage image. Did I miss something or is this not supposed to be possible?