Python __main__.py cannot import from its own module

I have a flask web application, but I get a module not found error when I am importing modules from my own app:

Traceback (most recent call last):  File "<frozen runpy>", line 198, in _run_module_as_main  File "<frozen runpy>", line 88, in _run_code  File "/Users/joey/projects/app/app/__main__.py", line 1, in <module>    from app import serveModuleNotFoundError: No module named 'app'

What is going wrong here? My __main__.py:

from app import serveserve()

My __init__.py:

from flask import Flaskfrom flask_sqlalchemy import SQLAlchemyfrom flask_migrate import Migrateapp = Flask(__name__)class Config(object):    UPLOAD_DIRECTORY = app.root_path +"/uploads/"    SQLALCHEMY_DATABASE_URI = "postgresql:///app_db"    SECRET_KEY = "secret key"app.config.from_object(Config)db = SQLAlchemy(app)migrate = Migrate(app, db)from .routes import home_page, download_page, upload_page, favicon_pageapp.register_blueprint(home_page)app.register_blueprint(download_page)app.register_blueprint(upload_page, url_prefix="/upload")app.register_blueprint(favicon_page)import app.routes as routesimport app.models as modelsdef serve():    return app.run(host="0.0.0.0", port=1212, debug=True)

And my file tree:

app├── Dockerfile├── LICENSE├── README.md├── requirements.txt├── service_entrypoint.sh└── app├── __init__.py├── __main__.py├── __pycache__│  ├── __init__.cpython-312.pyc│  ├── __main__.cpython-312.pyc│  ├── app.cpython-312.pyc│  ├── models.cpython-312.pyc│  ├── routes.cpython-312.pyc│  └── utils.cpython-312.pyc├── app.py├── files.json├── migrations│  ├── README│  ├── __pycache__│  │  └── env.cpython-312.pyc│  ├── alembic.ini│  ├── env.py│  ├── script.py.mako│  └── versions│  ├── 660c5066c59c_files_table.py│  └── __pycache__│  └── 660c5066c59c_files_table.cpython-312.pyc├── models.py├── routes.py├── static│  └── images│  ├── favicon-32x32.png│  ├── favicon.ico│  └── upload.png├── templates│  ├── base.html│  ├── download.html│  ├── index.html│  ├── upload.html│  └── upload_sucess.html├── uploads│  ├── 13879f7a_routes.py│  ├── 9bd5c043_files.json│  ├── b5459a5d_models.py│  └── file.txt└── utils.py

Am I doing anything wrong here? I would appreciate any help. Thanks for taking a look at this question.