I am trying to upload a pdf using flask. But whenever I click the submit button I get the following error:
Method Not Allowed
The method is not allowed for the requested URL.
I am not sure what to do, and why this is happening. Thanks for the help in advance.
Inside my index.html:
<form method="POST" action="/" enctype="multipart/form-data">
    <input type="file" class="form-control" id="customFile" name = "file"/>
    <input type="submit">
</form>
Inside my __init__.py I have:
Relative path: apps/__init__.py
def create_app(config):
    UPLOAD_FOLDER = ''
    app = Flask(__name__)
    app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
    app.config.from_object(config)
    return app
Inside my routes.py I have:
Relative path: apps/home/routes.py
from apps.home import blueprint
from flask import render_template, request, send_file, redirect, url_for, flash
from jinja2 import TemplateNotFound
import os
from werkzeug.utils import secure_filename
ALLOWED_EXTENSIONS = {'pdf'}
def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
@blueprint.route('/index', methods=['GET', 'POST'])
def index():
    if request.method == 'POST':
        # check if the post request has the file part
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        file = request.files['file']
        # If the user does not select a file, the browser submits an
        # empty file without a filename.
        if file.filename == '':
            flash('No selected file')
            return redirect(request.url)
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            return redirect(url_for('upload_file', name=filename))
    
    return render_template('home/index.html', segment='index')
 
    