In Service Desk Automation, you are restricted to only the options that are presented. Since "updated" isn't among the list you will have to be more creative. You can choose a comment added, or a status change which is about as close as you will get to the update.
What is your use case?
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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