can you place a url in the comment field for an attachment in confluence that is live?
I'm afraid not - comments for attachments are plain text only.
You could raise a feature request for this at https://jira.atlassian.com
I'm not sure if I understand your toughs, Mike, but, since Confluence 4.x was launched you can insert attachments on comments on a page via Add Comment > Insert > Attachment > Post. You will get a url to get access (download) to the attachment.
Hope it helps you!
Kind Regards
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