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Documents start expiring at an arbitrary date after they have been moved to a new knowledge center with no expiration dates implemented.
The documents were moved from a knowledge center that had expiration dates to a knowledge center that did not have expiration dates.
Use the Expiration Duration button and click OK on the dialog box (that says "0" days) to reset the expiration dates for all files. This will also re-enable any expired documents in that knowledge center.
Set the expiration date in the old knowledge center to 0 before moving the documents to the new knowledge center to prevent documents from expiring.
This article applies to all versions of Appian.
Last Reviewed: February 2017