public ActionResult <FileModel> Add(IFormFile file, int?storageDays) { var dto = new Application.Dto.FileAddDto() { File = file }; if (storageDays.HasValue) { dto.ExpireTime = DateTime.Now.AddDays(storageDays.Value); } var newfile = _fileAppService.Add(dto); return(Ok(CreateFileModel(Request, newfile))); }