/// # Arguments
	/// * `to` - Target chat ID.
	/// * `media` - List of attachments, non-empty.
	/// * `msg` - Message text (supports HTML formatting).
	///
	/// # Returns
	/// * `Result<()>` - fails if `media` is empty, problems forming media
	/// group, request fails.
	///   group, request fails.
	pub async fn sendgroup (&self, to: &ChatPeerId, media: Vec<Attachment>, msg: &str) -> Result<()> {
		if media.len() > 1 {
			let mut attach = vec![];
			let mut pos = media.len();
			for file in media {
				let mut doc = InputMediaDocument::from(
					InputFile::from(