public async Task <IActionResult> AddArchAttachmentAsync(string businessKey)
        {
            IFormFile formFile = HttpContext.Request.Form.Files.FirstOrDefault();

            if (formFile == null)
            {
                return(NotFound());
            }

            var arch = await archManager.GetArchByBusinessKeyAsync(businessKey);

            if (arch == null)
            {
                return(NotFound());
            }

            await archManager.AddArchAttachmentAsync(arch, formFile);

            return(Ok());
        }