Am I understanding your question correctly?
This is how I add an image to an Ubuntu help or wiki page:
1. Upload the image as an attached file.
2. Refer to the file with the following syntax (modified according to the relative location). Notice that '/artwork' corresponds to 'artwork' or './artwork' in bash (for subpages / directories) but not for the images / files themselves.
Code:
{{attachment:/artwork/mkusb128.png}}
as you can see at the beginning of this link if you look at the raw text.
It is a good idea to 'borrow' syntax from another wiki page that does something that you want to do (if you are lucky enough to find one, otherwise, just ask us ...).
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