How to configure upload folder for flask Blueprint()?

Solution
# .env file
UPLOAD_PATH=project/client/static/
# config.py

import os

class Config(object):
    UPLOAD_PATH = os.environ.get("UPLOAD_PATH")
# __init__.py

from config import Config

app = Flask(__name__)
app.config.from_object(Config)
import os


@main_blueprint.route("/tasks", methods=["POST"])
def run_task():
   # ...
   file.save(os.path.join(app.config["UPLOAD_PATH"], filepath)
# ...