GLB file type changes when trying to dwonload it from s3 through a signedURL from my s3 bucket

exports.uploadGLB = async (req, res) => {
  const file = req.file;
  //console.log("skslsk", file);
  let { _id } = req.params;
  //console.log("ID", _id);

  const imageName = generateFileName();
  
 const result = await uploadFile(file, imageName, file.mimetype)

  
  await unlinkFile(file.path);
 console.log(">>>>>>>>>>>>>>>",result)

 User.findOneAndUpdate(
  { _id: _id }, 
  { $push: { metaSpaces: result  } },
 function (error, success) {
       if (error) {
           console.log(error);
       } else {
           console.log(success);
       }
   });

  res.status(201).json({
    message: "Uploaded",
  });
};

exports.uploadFile = async (file, name, mimetype) => {
  //console.log("Uploadingg,,,,,,")
  //console.log("paramsss", fileBuffer, fileName, bucketName)
  const uploadParams = {
    Bucket: bucketName,
    Body: fs.createReadStream(file.path),
    Key: name,
    ContentType: mimetype,
  };
  const signedUrlExpireSeconds = 60 * 5;

  let url = s3Client.getSignedUrl("getObject", {
    Bucket: bucketName,
    Key: name,
    Expires: signedUrlExpireSeconds,
  });

//  console.log("url", url);
  return new Promise( (resolve, reject) => {
    s3Client.upload(uploadParams,(err,data)=>{
     if(data){
      let res = {url:url}
      resolve(Object.assign(res,data))
     }else
     {
      reject(err)
     }
  })
}); 


};