public function withFile($file)
    {
        $stream = Psr7\stream_for($file);
        $this->file = $stream;

        return $this;
    }
public function withFile($file)
    {
        $stream = Psr7\stream_for($file);
        $this->file = $stream;

        return $this;
    }
@param string|resource $file

@return $this