The field name specified in the form. The name of the file on the user's computer. The encoding type of the file. The mime type of the file. The size of the file in bytes. The folder to which the file has been saved. Set by _DiskStorage_. The name of the file within the `destination`. Set by _DiskStorage_. The full path to the uploaded file. Set by _DiskStorage_. The `Buffer` of the entire file. Set by _MemoryStorage_. The _Readable_ stream with the file data. This stream should not be read other than by a storage engine.