We haven't Bugziila option as on this help information.
https://confluence.atlassian.com/adminjiracloud/importing-data-from-bugzilla-803604010.html
This seems to be provided by system plugin
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How do I sure that I have this plugin? Where is this information located?
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Go to: admin panel => plugins => your plugins. Then you have to select system plugins.
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We don't have this menu. Maybe the reason that we have non-full version of JIRA?
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Does it mean that into admin panel => system => import&export => from external system you do not have Bugzilla one?
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