I send one picture to the bot's telegram, and the bot receives 4. What's the matter?

Question

Python

I am writing a telegram bot in python using aiogram.
Set up taking photos by the bot.
For the sake of interest, I decided to see what the photo transferred to the bot through print(message.photo).
I got several slightly different instances of the same photo as output

[<aiogram.types.photo_size.PhotoSize object at 0x000001A8AA2936D0>, <aiogram.types.photo_size.PhotoSize object at 0x000001A8AA2938B0>, <aiogram.types.photo_size.PhotoSize object at 0x000001A8AA2937C0>]

Why is this happening?

Answer 1

Telegram stores several copies of photos in different sizes, most likely to facilitate their display in clients. If the photo is large, and you only need to display a thumbnail, then it is better to take a finished thumbnail right away than to resize the original each time.