How to use preSignedUrl with putObejct to upload files to bucket?

Hello, this is my first time ever on this forum. However, this is not my first time using the Amazon services such as the S3.

This time I have come here because I found myself struggling with a piece code that should have been fixed in less than 15mins but there's not success yet.

I'm using the getSignedUrl method to create a preSignedUrl:

const aws = require('aws-sdk');
const ErrorResponse = require('../utils/ErrorResponse');
const asyncHandler = require('../utils/async');
const Media = require('../models/Media');

const s3 = new aws.S3({
  accessKeyId: process.env.AWS_ACCESS_KEY_ID_HEROKU,
  secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY_HEROKU,
  region: process.env.AWS_BUCKET_REGION_HEROKU,
  // apiVersion: '2012-10-17',
  signatureVersion: 'v4'
});


// @desc    Get preSignedURL from Amazon AWS S3
// @route   GET /api/v1/uploads/uploadObject
// @access  Private
// @status  DONE
exports.uploadObject = asyncHandler(async (req, res, next) => {
  
  const { originalName, type, userId, userEmail } = req.query;
  const fileExtension = type.substring(type.indexOf('/') + 1);
  const key = `${originalName
    .replace(/[^a-zA-Z0-9 ]/g, '')
    .toLowerCase()}-${userId}-${userEmail
    .toLowerCase()
    .replace(/[^a-z0-9]/g, '-')}-${Date.now().toString()}.${fileExtension}`;
  
  const params = {
    Bucket: process.env.AWS_BUCKET_NAME_HEROKU,
    Key: key,
    ContentType: type,
    Expires: 5000,
    ACL: 'public-read'
  };
  
  s3.getSignedUrl('putObject', params, (err, signedURL) => {
    if (err) {
      return next(
        new ErrorResponse(
          `There was an error with the files being uploaded`,
          500
        )
      );
    }
    
    res.status(201).json({
      success: true,
      data: {
        postURL: signedURL,
        getURL: signedURL.split(`?`)[0]
      }
    });
  });
});

The code itself I believe it works great because as far as I'm concerned it creates the preSignedUrl, the problem comes when I try to access to that URL, it then takes me to a page that displays an error of NoSuchKey. I'm running out of idea. Do any of you knows what it is that might be happening?

NOTE: My bucket is public to everyone.