I would like to be able to work on JIRA offline, then sync and upload my edits when I return to work and connect to the network.
Jira is an active service, not a passive data store. You will need a completely different local store to work on "offline" and sync later.
One option would be to have your own Jira running on your own machine, running with an app that can synchronise between your local Jira and the main one. This is expensive, clunky and the sync process will not be a 100% match.
The other option is a client that understands Jira and can sync when needed. The only one I am aware of is the Jira Client at https://almworks.com/jiraclient/overview.html
Last time I looked, there was a link to the docs on that page I gave, but I see it's been changed a bit and made less obvious. Hit the "Jira Client Reference" link in the top box, it will take you to the docs, and there's stuff in there about installing or deploying the client.
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