A marketing associate at Northern Trail Outfitters wants to send the final copy of the...

If a marketing associate at Northern Trail Outfitters is unable to see a data extension in the Preview and Test section when trying to perform a test send of an email in Content Builder, it could be because the data extension has the "Is Testable" flag unchecked. In Salesforce Marketing Cloud, data extensions can be configured with various properties, including the "Is Testable" flag, which determines whether the data extension is available for use in test sends and previews.

If this flag is not enabled for a specific data extension, it will not appear as an option in the Preview and Test section, preventing associates from selecting it for test sends. Enabling this flag on the data extension's properties allows it to be used for testing and previewing email content.