Hi all,
We want to migrate two cloud site as this instruction mention.
https://support.atlassian.com/migration/docs/perform-a-cloud-to-cloud-migration-for-jira/
But we can't find the option of Migrate Cloud Site as we navigate Setting > System.
What I get is Export and Import function, so I wonder what do I miss?

I am site-admin in both account.
By the way, if I can't use Migrate Cloud Site.
Then as I use import from external data, does the data of target site will be all deleted as mention overwrite all data?

Thanks.