Upload each chunk

uploadfile

//Step 2: upload each chunk (this will run for every chunk unlike the other steps which are run once)
var uploadRequest = new UploadPartRequest
{
    BucketName = bucketName,
    Key = fileName,
    UploadId = uploadId,
    PartNumber = partNumber,
    InputStream = ms,
    IsLastPart = lastPart,
    PartSize = ms.Length
};

var uploadResponse = _s3Client.UploadPart(uploadRequest);