Good day,
I have a Django app that I hosted on Heroku with the codes from GitHub, it deployed fine and I have a domain, for instance myapp.herokuapp.com.
But when I make some changes to the website itself, everything seems alright, then I make changes in the code and push it to GitHub. It deploys again perfectly, but all the former changes I made on the website get discarded, it now looks like a fresh deployed app.
Auto-deploy from GitHub is enabled in my Heroku settings.
how can I retain changes I make on the Heroku website after updating my code??
Heroku Dynos have an ephemeral file system therefore it cannot be used to persist data (at every redeployment all local changes are discarded).
You can use a database, either external (MongoDB Atlas) or the Heroku Postgres, both have a free tier.
If you need to save simple files you can use an external storage service (S3, Dropbox, even GitHub). See Files on Heroku for details and examples.