Getting EntityTooSmall Exception - amazon-web-services

Question

I am trying to download data from Azure blob in chunk and then trying to upload same chunk to aws s3 bucket.
While uploading I am getting "Your proposed upload is smaller than the minimum allowed size"exception. One thing I noticed, in upload response I am getting 0 content length. Data size I am trying is more than 300MB.
Any pointers what could be wrong here?
Below is my code snippet :
var remainingLength = blob.Properties.Length;
long startPosition = 0;
List<UploadPartResponse> uploadResponses = new List<UploadPartResponse>();
int i = 1;
string uploadId = string.Empty;
//Step 1: build and send a multi upload request
var initiateRequest = new InitiateMultipartUploadRequest
{
BucketName = existingBucketName,
Key = "firstobj"
};
var initResponse = client.InitiateMultipartUpload(initiateRequest);
uploadId = initResponse.UploadId;
do
{
var blockSize = Math.Min(segmentSize, remainingLength);
using (var ms = new MemoryStream())
{
blob.DownloadRangeToStream(ms, startPosition, blockSize);
//Step 2: upload each chunk (this is run for every chunk unlike the other steps which are run once)
var uploadRequest = new UploadPartRequest
{
BucketName = existingBucketName,
Key = "firstobj",
UploadId = uploadId,
PartNumber = i,
PartSize = ms.Length,
InputStream = ms
};
// Upload part and add response to our list.
var temp = client.UploadPart(uploadRequest);
uploadResponses.Add(temp);
}
//Step 3: build and send the multipart complete request
if (blockSize < segmentSize)
{
var completeRequest = new CompleteMultipartUploadRequest
{
BucketName = existingBucketName,
Key = "firstobj",
UploadId = uploadId,
};
completeRequest.AddPartETags(uploadResponses);
client.CompleteMultipartUpload(completeRequest);
}
startPosition += blockSize;
remainingLength -= blockSize;
i++;
}
while (remainingLength > 0);

Answer 1

After banging my head a lot, I got solution for this. It was in step 2 just before uploading part to AWS we should set stream position to 0.
uploadRequest.InputStream.Position = 0;