We have backported the Modern UI Nextcloud Zimlet that uses OAuth to the Classic UI. A number of partners have requested this Classic UI Zimlet since there are still many users the like to work with the Classic UI.
With the Nextcloud Zimlet you will be able to save emails and attachments from Zimbra to Nextcloud. And of course you can attach files from Nextcloud to email as a file or as a shared link.
To install the Classic UI Zimlet, just run
apt install zimbra-zimlet-nextcloud yum install zimbra-zimlet-nextcloud
Then as the user `zimbra` restart Zimbra mailbox:
Then both the Classic and Modern UI version of the Nextcloud Zimlet will be installed.