content
Media content of the message if the message was from another chat or topic; may be null for messages from the same chat and messages without media. Can be only one of the following types: messageAnimation, messageAudio, messageContact, messageDice, messageDocument, messageGame, messageInvoice, messageLocation, messagePhoto, messagePoll, messagePremiumGiveaway, messagePremiumGiveawayWinners, messageSticker, messageStory, messageText (for link preview), messageVenue, messageVideo, messageVideoNote, or messageVoiceNote.