public async Task <bool> HandleAsync(SetProcessOfGenerationAnnex message)
        {
            var annexCollection = await annexCollectionRepository.GetByNotificationId(message.Annex.NotificationId);

            var file = annexFactory.CreateForNotification(nameGenerator,
                                                          await notificationApplicationRepository.GetById(message.Annex.NotificationId),
                                                          message.Annex.FileBytes,
                                                          message.Annex.FileType);

            var fileId = await fileRepository.Store(file);

            annexCollection.SetProcessOfGenerationAnnex(new ProcessOfGenerationAnnex(fileId));

            await context.SaveChangesAsync();

            return(true);
        }