Based on the information in the CloudFiles Event Handler Flow Template article on how to correctly set up the platform event triggered flow to receive the CloudFiles event, you should have a valid output in the Get Event Details action. Once you have that, you can now use the variety of CloudFiles Event Types to receive various types of information and perform your desired actions.

Here is the complete list. Each item has an individual article that explains the output of the Get Event Details action as well as lay down some use-cases for the specific event type.