This is the example for the youtube video of how to upload your discord bot to heroku to run your bot 24/7.

ADD YOUR MODULES THAT ARE NOT PRE-INSTALLED WITH PYTHON IN THE requirements.txt

discord and asyncio should be added there if you're hosing your python bot or your discord bot will not work

Video link: https://www.youtube.com/watch?v=Wal2taXZEAY&t=1s