public async Task <string> Upload(IEnumerable <IFormFile> files)
        {
            string uniqueShortFolderName = _guidService.GenShortUniqueName();
            string destinationPath       = _appEnvironment.ContentRootPath + @"\Files\";

            try
            {
                foreach (var file in files)
                {
                    if (file != null)
                    {
                        Directory.CreateDirectory(destinationPath + uniqueShortFolderName);

                        var    typeFile = Path.GetExtension(file.FileName);
                        var    fileName = @"\" + Path.GetFileNameWithoutExtension(file.FileName);
                        string filePath = destinationPath + uniqueShortFolderName + fileName + typeFile;

                        await using var stream = new FileStream(filePath, FileMode.Create, FileAccess.ReadWrite, FileShare.Read);
                        await file.CopyToAsync(stream);
                    }
                }
                return(uniqueShortFolderName);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            return(null);
        }