Gets whether the file still needs to be saved.

Gets the MIME type of the file. This is either passed in to the constructor or inferred from the file extension. "unknown/unknown" will be used if neither is available.

Gets the name of the file. Before save is called, this is the filename given by the user. After save is called, that name gets prefixed with a unique identifier.

Gets the url of the file. It is only available after you save the file or after you get the file from a ParseObject.