uploads := slack.UploadFileV2Parameters{
	Filetype:        "auto",
	Filename:        "Loading...",
	FileSize:        int(fileSize),
	Reader:          fileBuffer,
	Channels:        []string{n.BotEvent.ChannelID},
	Channel:         n.BotEvent.ChannelID,
	ThreadTimestamp: n.BotEvent.ThreadTimeStamp,
	Title:           appMentionTmpl.Title,
	//InitialComment:  appMentionTmpl.InitialComment,
}

uploadResp, er := n.Messenger.CompleteUploadExternal(ctx, uploads)

   payload := slack.RemoteFileParameters{
	ExternalID: s.uuidGenerator.New(),
	Title:      fmt.Sprintf("Model: %s", n.Data[ThreadWorksheetName]),
	// PreviewImage:       text,
	PreviewImageReader: nlsObject.Reader,
}
_, err = n.Messenger.UpdateRemoteFile(ctx, fileID, payload)
if err != nil {
	return fmt.Errorf("failed to update remote file: %w", err)
}