upload-to-azure-storage.cs

var storageAccount = CloudStorageAccount.Parse(_configuration["MicrosoftAzureStorage:AzureStorageConnectionString"]);
var backOffPeriod = TimeSpan.FromSeconds(2);

var blobClient = storageAccount.CreateCloudBlobClient();
blobClient.DefaultRequestOptions = new BlobRequestOptions()
{
    SingleBlobUploadThresholdInBytes = 1024 * 1024, //1MB, the minimum
    ParallelOperationThreadCount = 1,
    RetryPolicy = new ExponentialRetry(backOffPeriod, maxAttempts: 5),
};
var videoContainer = blobClient.GetContainerReference("videos");

videoContainer.CreateIfNotExists();

var blockBlob = _videoContainer.GetBlockBlobReference(filename);
blockBlob.Properties.ContentType = section.ContentType ?? "application/octet-stream";
storedUrl = blockBlob.Uri.AbsoluteUri;

await blockBlob.UploadFromFileAsync(tempFilename);