S3 Presigned Api UploadController Partial 2

UploadController.cs

string bucketName = "";
string key = Guid.NewGuid().ToString() + ".txt";
RegionEndpoint bucketRegion = RegionEndpoint.USEast1;

var client = new AmazonS3Client(bucketRegion);

var putRequest = new PutObjectRequest
{
    BucketName = bucketName,
    Key = key,
    ContentBody = createSignedUrlRequest.Content
};

PutObjectResponse putObjectResponse = await client.PutObjectAsync(putRequest);