how to view attachments in jira without downloading
You can use Wiki Markup in Comments (and other fields where it is activated (I think you can activate it in the field config but I am to lazy to look after it right now )
If you look at the relevant documetnation of the wikimarkup (https://jira.atlassian.com/secure/WikiRendererHelpAction.jspa?section=images) you see that you can add some images.
It doesn't support all file types but to add the usual snapshot to a ticket it is enough
Obviously, your browser still has downloaded them so it can display them, but they'e a little harder to get to than a "copy" style download.
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