We are working on adding an application in our Jira tool. We are not able to see an option "Add-ons" or "Upload app" in Manage Apps, to add the plugin.
Welcome to the Atlassian Community.
If you are trying to upload an app as you do in Server/DC deployments, you can't. The way apps work in cloud is different, and so does the app development. For information about developing your own apps for Jira Cloud, see the Jira Developer documentation. If you're trying to install an app or integrate your Jira with an external application, see Integrate apps.
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