Install draw.io for Jira
Your administrator can add draw.io for Jira easily from the Atlassian Marketplace.
In your Jira instance, go to: Jira Administration > Add-ons in the menu. Type draw.io in the search field, then press Enter. draw.io for Jira will be the top app in the list. Click either Free trial (you’ll be redirected to MyAtlassian to get the trial license), or Buy now.
draw.io for Jira will be visible in the list of apps installed in your instance under Manage add-ons.
Important: You must make sure that your Jira users have the “Create attachment” permissions, otherwise they won’t be able to save their draw.io diagrams to the issue!