A very common purpose for uploading Files is to provide images for display on an Expression. Other Files can be PDF, audio, text, movie, documents etc.
Additional meta information is allowed in the File Object including a File Type (i.e. image, pdf, etc.), description, and File order.
For example, File order would be valuable if five images were uploaded and an Expression needed to display them in a particular order.
Additional information related to Files is also available for tracking via the endpoint, including rights (IP) information and rights expiration dates.
For example, the dates the usage rights for an image will expire can be tracked.
Use the Files API to manipulate and deliver Files in the size and format needed for a specific Expression.