Multer es un módulo de Node.js: – req.file no está definido.

Estoy creando una aplicación utilizando Node, Express y ejs y multer para subir imágenes. Cada vez que envío el formulario, req.file es undefined. He pasado todo el día resolviendo problemas, pero no puedo entender qué estoy haciendo mal.

HTML:

<form action="/post" id="formPost" method="post" enctype="multipart/form-data">
     <input class="img-file" type="file" name="image" required="">
     <input class="submit" type="submit" value="Post">
</form>

app.js:

const path = require('path');
const express = require('express');
const morgan = require('morgan');
const bodyParser = require('body-parser');
const multer = require('multer');
const app = express();

app.use(express.static(path.join(__dirname, 'public')))
app.set('view engine', 'ejs');
app.set('views', path.join(__dirname,'resources/views'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, "./image");
  },
  filename: function (req, file, cb) {
    console.log(req.file);
    cb(null, Date.now() + "-" + file.fieldname + ".png");
  },
});
const upload = multer({ storage: storage });
app.post("/post", upload.single("image"), (req, res) => {
      console.log(req.file);
});
app.get("/post", (req, res) => {
  res.render("post");
});
app.listen(3000, () => {
  console.log("Example app listening at http://localhost:3000/login");
});