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This video demonstrates how a user can update a piece of published content, and send those updates through the revision process, without affecting the published version of that content.
Updating published content
This is where Workbench really shines! Logged in as "Author", I'm going to view the article. We see that the most recent revision is the published version. Let's say that I need to update the article after it was published. I can simply click the "New Draft" tab to make my updates.