You may link to files uploaded with the current node using special tags. The tags will be replaced by the corresponding files. For example:
[inline:2]will be replaced by the 2nd file uploaded with the node. (You may also use "attachment" or "file" instead of "inline".)
You may also optionally specify the title text for the file. For images, the title text will be used as a roll-over tooltip. For all other files, the title text will be the actual link text. For example:
[inline:1=This is a file]will be replaced by This is a file (if the uploaded file is not an image).
If the file is an image, it will be displayed inline, otherwise a link to the file will be inserted.