Why doesn't Flask see templates?

Question

Flask

Created a folder templates, threw the index.html file there with markup
Created a couple of files, everything seemed to work until it got to the point where I created view.py
The view.py file itself looks like this:

from app import app
from flask import render_template
@app.route('/')
def index():
    return render_template('index.html')

And where I call it, the file looks like this:

from app import app
import view
if __name__ == '__main__':
    app.run()

But the browser has a Not Found error. Tell me, please, how to fix this?