How to make a post request in Node with Mongoose

I was following a tutorial(https://medium.com/weekly-webtips/building-restful-apis-with-node-js-and-express-a9f648219f5b) to build an API but it’s from 2 years ago and I can’t quite seem to change the code to accommodate more recent updates in the library. I’m able to get the get request to work but not the post. When I do

.post(addNewCoordinates);

I get “Error: Route.post() requires a callback function but got a [object Undefined]”

Which the internet said to add async await which I did. Am I missing something else??

The setup I have with the mongodb is I created a database in the compass GUI and that’s literally it.(i technically have a collection in the database)

Here is my index.js

import express from 'express';
import routes from './src/routes/coordinatesRoutes';
import mongoose from 'mongoose';
import bodyParser from 'body-parser';

const app = express();
routes(app)
const PORT = 1234;
// Will print at localhost:{Port}
app.get('/', (req, res) =>
  res.send(`Node and express server running on port ${PORT}`)
)
// Will print in terminal
app.listen(PORT, () =>
console.log(`Your server is running on port ${PORT}`))

// Database Setup

// mongoose connection
mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost:27017/coordinates', {
  useNewUrlParser: true,
  useUnifiedTopology: true
})
//bodyparser setup
app.use(bodyParser.urlencoded({ extended: true}));
app.use(bodyParser.json());

app.use(function(req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
});

coordinatesController.js:

import mongoose from 'mongoose';
import { InputDataSchema } from '../models/coordinatesModel'
const InputData = mongoose.model('InputData', InputDataSchema);
const addNewCoordinates = async  (req,res) => {
  let newCoordinates =  new InputData(req.body);
   await newCoordinates.save((err, coordinates) => {
    if (err) {
      res.send(err)
    }
    res.json(coordinates)
  })
}

export default addNewCoordinates;

coordinatesModel.js:

import mongoose from 'mongoose';
const Schema = mongoose.Schema;
export const InputDataSchema = new Schema({
  latitude: {
    type: Number,
    required: "Enter latitude"
  },
  longitude: {
    type: Number,
    required: "Enter longitude"
  },
  altitude: {
    type: Number,
    required: "Enter altitude"
  },
  ecef: {
    type: Array
  },
  created_date: {
    type: Date,
    default: Date.now
  }
})

coordinatesRoute.js

import { addNewCoordinates } from '../controllers/coordinatesController'
const routes = (app) => {
    //create route for donations
    app.route('/lla')
      //create get request
      .get((req, res) =>
      res.send('GET request successful!'))
      //create post request
      .post((req, res) =>
      res.set('POST request successful!'));
      // This crashes and gives me a Route.post() requires a callback function but got a [object Undefined] so I'm just trying to focus on getting a post without really any data.
     //.post(addNewCoordinates);

    // create a new route so you can get these donation entries by their ID's
    app.route('/lla/:timestamp')
      //create put request
      .put((req, res) =>
      res.send('PUT request successful!'))
      //create delete request
      .delete((req, res) =>
      res.send('DELETE request successful'))
  }
  export default routes;

Thanks for any help!!