Hello, Is it possible to upload files to Google Cloud Storage?

I have set my column:
…..
$col["edittype"] = "file";
$col["upload_dir"] = 'gs://my_bucket/Images';

It seems that I need to modify the grid to upload using a special Google 'upload url':
https://cloud.google.com/appengine/docs/php/googlestorage/user_upload#createuploadurl_options

$options = [ 'gs_bucket_name' => 'my_bucket' ];
$upload_url = CloudStorageTools::createUploadUrl('/upload_handler.php', $options); //replace with phpgrid??

Any assistance is appreciated.

Thank you.