Maybe you all know this, but I can never remember how to do it (I always have to find the instructions from @rearmstr who told the P’ton group about it).
When you attach a file you can refer to the file in the comment as !filename.ext! This is incredibly useful, as you don’t have to say things like, “See the attachment” and have your colleagues scroll up and try to find the plot in question.
If it’s a large plot, you can set the display width: !filename.ext|width=600! You can even display thumbnails: !filename.ext|thumbnail!
The documentation is at: https://jira.atlassian.com/secure/WikiRendererHelpAction.jspa?section=all