Ermm... I don't understand JSPWiki's concept of attachment. When I attach a file to a page I edit, the resulting page does not show any sign or indication of the file or even of the fact that something has, in fact, been attached, which is what I expect. That is, something in the style of email attachments, which result in clickable links on the mail reader's page.
Look under the "Attach" tab. They were delegated off the main page in the default template for clarity's sake. It's trivial for you to change the template to show them under the page text, if that is what you want.
/Janne
