flask-server/kinolist/__init__.py

import os
from dotenv import load_dotenv
from flask import Flask

from kinolist import pages, database, login

load_dotenv()

def create_app():
    app = Flask(__name__)
    app.config.from_prefixed_env()
    login.login_manager.init_app(app)
    database.init_app(app)

    app.register_blueprint(pages.bp)
    
    base_dir = os.path.abspath(os.path.dirname(__file__))
    
    # Set the UPLOAD_FOLDER to the parent directory of your project
    app.config['UPLOAD_FOLDER'] = os.path.join(base_dir, '..', 'posters')
    
    return app