getStream() : \Psr\Http\Message\StreamInterface
Retrieve a stream representing the uploaded file.
This method MUST return a StreamInterface instance, representing the uploaded file. The purpose of this method is to allow utilizing native PHP stream functionality to manipulate the file upload, such as stream_copy_to_stream() (though the result will need to be decorated in a native PHP stream wrapper to work with such functions).
If the moveTo() method has been called previously, this method MUST raise an exception.
in cases when no stream is available or can be created.
Stream representation of the uploaded file.