How do get the changes made in the Nextcloud environment to be sent as a notification mail?
Configure your server’s email settings: https://docs.nextcloud.com/server/stable/admin_manual/configuration_server/email_configuration.html
Make sure you have the activity app installed and enabled: https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/activity_configuration.html#activity-app
Then go in your settings and check the boxes for the activity notifications you want: https://docs.nextcloud.com/server/latest/user_manual/en/userpreferences.html
this method is too complicated