https://marketplace.atlassian.com/plugins/com.hascode.plugin.jira-quick-subtasks/server/overview
I can download this but I am unable to find it via by account's "Find new add-on".
Regards,
K
You can't install that type of add-on in Cloud.
Note that the drop-down that says "server" on the page you linked to contains "cloud", but greyed out, as there is no version available for Cloud.
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