I have this Flask app:

from flask import Flask, request

app = Flask(__name__)

@app.post('/upload')
def upload_file_json():
    
    file = request.files['file']
    
    num_1 = int(request.form['AA_num'])
    num_2 = int(request.form['BB_num'])
    

    return {"type":type(file), "num": num_1 + num_2}

I use this request but is not working:

import requests


api_url = 'http://127.0.0.1:5000/upload'  
pdf_path = 'my_CV.pdf'

headers = {
    'Content-Type': 'multipart/form-data',
}

# Prepare the payload
payload = {
    'file': open(pdf_path, 'rb'),
    'AA_num': "34",
    'BB_num': "55"
    }


response = requests.post(api_url, headers=headers, files=payload)


print(response.json())

What is the right request that I need to use to be able to call the API?

I tried other requestes taking similar responses from StackOverflow but none worked.