UpdateOne is not working Express and Mongodb - node.js

Question

I am trying to update a content in Mongodb with the help of function UpdateOne but I keep getting "0 document(s) matched the filter, updated 0 document(s)". I am not sure what I am doing wrong here.
In the end you can see the attached picture from postman where I am sending the request
doucumnets.js
const database = require('../db/database.js');
const ObjectId = require('mongodb').ObjectId;
const documents = {
updateDoc: async function updateDoc(id, newContent) {
let db;
try {
db = await database.getDb();
const filter = { _id: ObjectId(id) };
const options = { upsert: false };
// // const query = {_id: "633abe851b36b295c11f74b5"};
// // const update = { $set: { contents: "Updated!!!"}};
const updatedDoc = {
$set: {
"contents": newContent
},
};
// console.log(filter);
// const result = await db.collection.updateOne( id, newContent, options );
const result = await db.collection.updateOne( filter, updatedDoc, options );
console.log(
`${result.matchedCount} document(s) matched the filter, updated ${result.modifiedCount} document(s)`,
);
return result;
} catch (error) {
return {
errors: {
message: error.message
}
};
} finally {
await db.client.close();
// console.log(db.close());
}
},
};
module.exports = documents;
route/index.js
const express = require('express');
const router = express.Router();
const documentsModel = require('../models/documents.js');
router.put("/update", async(req, res) => {
try {
const oldId = req.body.id;
const newContent = req.body.newContent;
const result = await documentsModel.updateDoc(oldId, newContent);
return res.status(201).json({ data: result});
} catch (errors) {
console.error(errors.message);
res.send(400).send('Problem with server');
}
});
module.exports = router;