AWS S3 Image Uploader with NodeJS and s3-uploader module

I am trying to use this module https://www.npmjs.com/package/s3-uploader but for me it's not clear how to implement it. How to do a POST to my router ?

.post('/upload', ensureAuthenticated, (req, res, next) => {

}

Does anybody is using this NodeJS module? Please I need help to understand it. Thank you so much

I found a related but not fully helpful topic in this thread: Node.js S3-uploader issue

via Matt