src/flask_app.py

import os

from flask import Flask

UPLOAD_FOLDER = r'static/uploads/'
if not os.path.isdir(UPLOAD_FOLDER) : 
    os.makedirs(UPLOAD_FOLDER, exist_ok=True)

flask_app = Flask(__name__)
flask_app.secret_key = "secret key"
flask_app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER