How do I specify mime type for the file that I am uploading. I am following this nodejs example https://cloud.google.com/storage/docs/object-basics#storage-upload-object-nodejs
```
function uploadFile (bucketName, fileName, callback) {
// Instantiates a client
const storageClient = Storage();
// References an existing bucket, e.g. "my-bucket"
const bucket = storageClient.bucket(bucketName);
// Uploads a local file to the bucket, e.g. "./local/path/to/file.txt"
bucket.upload(fileName, (err, file) => {
if (err) {
callback(err);
return;
}
console.log(`File ${file.name} uploaded.`);
callback();
});
}
I always get default
application/octet-stream