With MoinMoin you can directly append files to a wiki page.

letter.txt {{attachment:foto.jpg}} (!) As long as the files aren't uploaded: the links are grey (like links to non-existent wiki pages). an alternate image, like a paper clip, is displayed for non-existent embedded pictures. You can click on it and upload the file from your computer's file system to the wiki using your browser. Then the design is regular and: links are blue. the image appears.