How can a bot change a message?

Question

Python

How to make a telegram bot change messages

@dp.message_handler(commands=['start'])
async def start(message: types.Message):
  await bot.send_message(message.chat.id, 'Ждем: 2сек')
  await sleep(1)
  await bot.edit_message_text(chat_id=message.chat.id, message_id=message.message_id, text='Ждем: 1сек')
  await sleep(1)
  await bot.edit_message_text(chat_id=message.chat.id, message_id=message.message_id, text='Готово')

But it gives an error aiogram.utils.exceptions.MessageCantBeEdited: Message can't be edited

Answer 1

message in this function is the message of the user who wrote /start. Then the bot tries to edit this message... and it doesn't work! Of course, because he can only edit his own messages, but not others.
He should just edit his own post, not the user's post:

my_new_message = await bot.send_message(message.chat.id, 'Ждем: 2сек')
await sleep(1)
await bot.edit_message_text(chat_id=message.chat.id, message_id=my_new_message.message_id, text='Ждем: 1сек')
...

Answer 2

First you need to take your first message and shove it into a variable and manage to send it using this line:

m = await bot.send_message(message.chat.id, 'Ждем: 2сек')

Then you also change it asynchronously: Maybe this is not true, test it, because without an error it's hard to say something right off the bat... await m.edit(content = "Ждем: 1сек")