Yes - as the presentation's author or a company administrator, you can edit your presentations after they expire:
- Go to your My Content section
- Select the Edit Option
- Make any desired changes
- Select Apply/Save
If you want the presentation to be activated after the set expiration date, you must either remove or extend the expiration date. This is done by editing your presentation and clicking on the Security tab. Modify the expiration date and "Save".
Please review this document for more information.