There is a question, how to download new files or all files from a channel using python and telegram api?
And how to make the script using api detect new files?
I googled for information, but didn't find any information on this topic
You need some Telegram client module, e.g. Pyrogram.
To be able to interact with the API you'll have to authorize first. After that handle update and check whether a message contains images and then download them.