Node.js upload to Amazon S3 works but file corrupt upload

I do believe you need to pass a stream instead of the file path, you can use fs.createReadStream like this:

router.post('/updateschedule', isLoggedIn, upload.single('schedulepicture'), function(req, res) {
  var scheduleImageToUpload;

  //Check if image was uploaded with the form & process it
  if (typeof req.file !== "undefined") {

    //Create Amazon S3 specific object
    var s3 = new aws.S3();
    var stream = fs.createReadStream(req.file.path)

    //This uploads the file but the file cannot be viewed.
    var params = {
      Bucket: S3_BUCKET,
      Key: req.file.originalname, //This is what S3 will use to store the data uploaded.
      Body: stream, //the actual *file* being uploaded
      ContentType: req.file.mimetype, //type of file being uploaded
      ACL: 'public-read', //Set permissions so everyone can see the image
      processData: false,
      accessKeyId: S3_accessKeyId,
      secretAccessKey: S3_secretAccessKey
     }

    s3.upload( params, function(err, data) {
      if (err) {
        console.log("err is " + err);
      }
      res.redirect('../adminschedule');
    });
  }
});