With {{attachment:myfile.png}} you can create a link to an attachment (and use the link to upload the attachment).

2009-01-06
[DIFF] TableOfContents 18:02 Info mmfpcp04 Upload of attachment 'Union Article'.
2008-12-31
[DIFF] FreeTheUCDay 17:53 Info Matthew Taylor [1-2]
2008-12-22
[DIFF] Disorientation Zine/2007/2008 Revisions 04:49 Info calinfo [1-3]
[DIFF] FrontPage 04:48 Info calinfo
2008-12-07
[DIFF] BadContent 21:50 Info Antispam subsystem
2008-11-20
[DIFF] Disorientation Zine/2007/UCDemocracy Summit 23:49 Info 75-101-11-163 [1]
calinfo [2-23]		 #01 aaron- this thing is awesome, hell yeah!
#13 Upload of attachment 'DSC00056.jpg'.
#17 Upload of attachment 'DSC00056.JPG'.
[DIFF] Disorientation Zine/2007/participatory 06:08 Info calinfo [1-3]
[DIFF] Disorientation Zine/2007/ballot 06:01 Info calinfo
2008-05-27
[DIFF] Stop The War And Spying 23:00 Info Matthew Taylor
2008-05-02
[DIFF] Disorientation Zine/2007/Democratizethe UCRegents Constitution 04:45 Info calinfo [1-5]
[DIFF] edit 04:33 Info calinfo [1-2]

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