This is an admin permission duty.

Select the files you wish to set or update the expiration date for.

In the function bar, choose More / Update Expiration Date. Then pick your date. You can even set it to a previous date to expire the file immediately.

You can even set the date to a previous date to expire the file(s) immediately.

When the file expires the date-setter gets an email alerting them to the event. And the file can then no longer be downloaded.  THe download option disappears and is replaced with a REQUEST ACCESS option.  Users may REQUEST the file from the admin. 

Related topics:
Setting an Expiration Date on a Single File

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