Heroku via Github, where is my JSON files updated?

Question

This isn't exactly a question in need of help, however, I am curious as to which file is updated, when updated, when I use Heroku via Github. Would it be the one within my Github or does Heroku save those files and update them somewhere else?

All I'm trying to accomplish is edit a JSON file so I can store an integer to each player (I'm using a worker, for a discord bot). Also, yes, that seems like what I am trying to do. Anything that saves the information, doesn't require money and isn't too complex

EDIT:

This issue has been solved with the answer that Heroku simply cannot update JSON files. I have resolved it myself by moving my host onto a Raspberry Pi 3 Model B+. Thank you for all the answers.

Answer 1

When you use Heroku's GitHub Sync feature, a deployment will retrieve your code directly from GitHub. Those files aren't saved anywhere else. A new deployment from master will take the code fresh from GitHub.