In Touch UI dailog when we use file upload type e.g. cq/gui/components/authoring/dialog/fileupload or granite/ui/components/foundation/form/fileupload field to allow authoring assets from the side panel. In order to author the images, side panel should be opened before editing via dialog. AEM Page editor with side panel and dialog opened Authoring image using drag and drop If you forgot to open the side panel before opening the dialog then you need to close the dialog, open side panel and open the dialog again to author assets. This is kind of annoying to close the dialog and open it again just to author images/Assets.