A request to send a message has reached the Telegram server. This doesn't mean that the message will be sent
successfully. This update is sent only if the option "use_quick_ack" is set to true. This update may be sent multiple
times for the same message.
Subtype of Update.
A request to send a message has reached the Telegram server. This doesn't mean that the message will be sent successfully. This update is sent only if the option "use_quick_ack" is set to true. This update may be sent multiple times for the same message. Subtype of Update.