Dropbox api file download and upload to s3

Question

im trying to download the file from dropbox using v2 api and upload it to amazon s3

to download file here is what i did:

$headers= array(
                        'Content-Type: ',
                        "Authorization: Bearer EkOrS5mbVAwA....",
                        "Dropbox-API-Arg: {\"path\": \"/clients/erbrecht, kenneth/2nd dispute erbrecht.docx\"}");
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, 'https://content.dropboxapi.com/2/files/download');
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_POST, 1);
        //curl_setopt($ch, CURLOPT_POSTFIELDS,json_encode($data));
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $response  = curl_exec($ch);
        curl_close($ch);

the code above returned response in "application/octet-stream" i assume, so my first problem is to convert this stream to a file and upload it to s3

i have this code that takes physical path of the file and upload it to s3 but in the above case i have the stream

try{
        $s3 = Aws\S3\S3Client::factory(array(
                                            'region'    =>  S3_REGION,
                                            'version'   => 'latest',
                                            'credentials' => array(
                                                'key' => S3_ACCESS_KEY,
                                                'secret'  => S3_SECRET_KEY,
                                              )
                                        ));



        $s3->putObject([
            'Bucket'    =>  $this->s3bucket,
            'Key'       =>  "uploads/{$name}",
            'Body'      =>  fopen($path,'rb'),
            'ACL'       =>  'public-read'
        ]);

            return '';
    }catch(S3Exception $e){
        //return $e->getMessage();
        return 'Error Uploading File, Please try again';
    }

so the problem is to convert stream to file and upload to s3, how can i change the above code to do that

Thanks in advance.