public async Task BebopWatermarkImagesAsync() { IReadOnlyCollection <Attachment> attachments = await AttachmentHelper.GetMostRecentAttachmentsAsync(Context, AttachmentFilter.Images); if (attachments == null) { await ServiceReplyAsync(NO_ATTACHMENTS_FOUND_MESSAGE); return; } var images = _imageService.BebopWatermarkImages(attachments); await SendImages(images); }