How to send a picture sent by a user to python-telegram-bot?

Question

Python

How to make a bot send a picture sent to it by a user like an echo bot with text?
I made this handler:

updater.dispatcher.add_handler(MessageHandler(Filters.photo, get_pic))

And the function looks like this:

def get_pic(update, context):
    photo = update.message.file_id
    update.send_photo(chat_id=update.message.chat_id, photo=photo, reply_markup=full_keyboard())

But when sending, nothing happens. What to fix?

Answer 1

Searching in other people's codes led to this:

def get_pic(update, context):
    photo = update.message.photo[-1]
    update.message.reply_photo(photo=photo, reply_markup=full_keyboard())

Answer 2

context.bot.send_photo(chat_id=chat_id, photo=photo, reply_markup=full_kb)