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From the time of the creation of the issue to delivering the reporter, all attachment must be hidden from reporter,when issue delivered to reporter(when closed) reporter can see attachment/s.
How Do this process?
This is not possible in Jira natively. We had a feature request for it but we closed it as we have no plans to implement this:
There is a comment from Roy Krishna that mentions a few workarounds that could work for you, so please have a look at those.
Let us know if you have any questions.