I used the following link as a reference: https://codehandbook.org/creating-a-web-app-using-angularjs-python-mongodb/
Run the Python Flask App from the answers directory:
python3 pythonFlaskApp.py
Go to your browser and navigate to
http://localhost:5000/
The .csv files in this directory can be used for uploading on the web app.
More details can be found in the README.md of calAnswers/answers.