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If the Flask server is currently running in debug mode and you make any changes to Flask .py files, the Flask server will automatically restart. If you have not yet started the Flask server, you can do so by going to the project root folder and running
py app.py
If you made any changes to React components, you'll need to build the project so that Flask can serve your changes.
Do this by going to the react_frontend
folder and running
npm run build
If your Flask server is already running, these new changes will automatically be picked up by the Flask server without needing to restart it.