I am trying to upload files from a particular folder location to a sample S3 bucket. I am using standard nodejs aws-sdk for this. Files are deepzoom images (.dzi) files. Files are getting uploaded to my S3 bucket but the contents of the file are not getting uploaded properly. Like I am uploading images of sizes 800B, but after uploading the size of image is only 7B. I tried downloading it to see its content but the file doesn't contains the image but just the file name. This is the code I am running for uploading files:

function read(file, numFiles) {
fs.readFile(file, function (err, data) {
  if (err) console.log(err);
  const fileContent = Buffer.from(file, "binary");
  s3.putObject(
    {
      Bucket: "sample-bucket",
      Key: file,
      Body: fileContent,
    },
    function (resp) {
      console.log(arguments);
      console.log("Successfully uploaded, ", file);
      uploadCount++;
      console.log("uploadcount is:", uploadCount);
      if (uploadCount == numFiles) {
        res.send("All files uploaded");
      }
    }
  ).on("httpUploadProgress", (evt) => {
    console.log(`Uploaded ${evt.loaded} out of ${evt.total}`);
  });
});

}

I am passing files to this read function from another function. I am not sure why this is happening. Any help would be appreciated.

Before uploading image properties:

Property of image uploaded to S3 bucket: