Use this method when you need to tell the user that something is happening
on the bot's side. The status is set for 5 seconds or less (when a message
arrives from your bot, Telegram clients clear its typing status).
Usage
sendChatAction(chat_id, action)
Arguments
chat_id
Unique identifier for the target chat or username of
the target channel.
action
Type of action to broadcast. Choose one, depending on
what the user is about to receive:
typing for text messages
upload_photo for photos
upload_video for videos
record_video for video recording
upload_audio for audio files
record_audio for audio file recording
upload_document for general files
find_location for location data
upload_video_note for video notes
record_video_note for video note recording
Details
You can also use it's snake_case equivalent send_chat_action.