File Upload Controller in .NET Core Web MVC application

FileUploadController.cs

public class FileUploadController : Controller
{
  private readonly StorageConfig storageConfig;

  public FileUploadController(StorageConfig storageConfig)
  {
      this.storageConfig = storageConfig;
  }

  [HttpPost("FileUpload")]
  public async Task<IActionResult> Index(List<IFormFile> files)
  {
    long size = files.Sum(f => f.Length);
    string fileNamePattern = @"^[\w\-. ]+$";

    var filePaths = new List<string>();
    foreach (var formFile in files)
    {
        if (formFile.Length > 0)
        {
            bool shouldProcess = Regex.IsMatch(formFile.FileName, fileNamePattern);
            if (shouldProcess)
            {
                filePaths.Add(formFile.FileName);
                await UploadFileToStorage(formFile.OpenReadStream(), formFile.FileName);
            }
        }
    }

    return Ok(new { message = "Files uploaded to Blob", count = files.Count, size, filePaths });
  }

  private async Task<bool> UploadFileToStorage(Stream fileStream, string fileName)
  {
    //// STEP 1: Create Blob URI
    string blobHost = $"https://{storageConfig.AccountName}.blob.core.windows.net/";
    string containerFilePart = $"{storageConfig.ContainerName}/{fileName}";
    Uri blobUri = new Uri($"{blobHost}{containerFilePart}");

    // STEP 2: Storage Credentials
    StorageSharedKeyCredential storageCredentials
        = new StorageSharedKeyCredential(storageConfig.AccountName,
                                            storageConfig.Key);

    // STEP 3: Upload using BlobClient object
    BlobClient blobClient = new BlobClient(blobUri, storageCredentials);
    await blobClient.UploadAsync(fileStream);

    return await Task.FromResult(true);
  }
}