Copio lo que encontré en la página de soporte de Microsoft
PowerPoint doesn’t have a Track Changes feature like the one in Word, but you can receive comments and feedback from reviewers by first saving your presentation to your computer, and then posting a second copy to a shared location such as
OneDrive or
SharePoint. You can ask people to make changes and add comments to the shared copy. Once they are done, compare and merge the shared copy with the original saved on your computer.
https://support.office.com/en-us/art...5-cf418f03c279