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.