GTLDriveParentReference *parentRef = [GTLDriveParentReference object];
parentRef.identifier = self.kDriveMusicDirID;
parentRef.isRoot = NO;

GTLDriveFileThumbnail *thumbnail = [[GTLDriveFileThumbnail alloc] init];
thumbnail.image = GTLEncodeWebSafeBase64(UIImageJPEGRepresentation(file.image, 80));
thumbnail.mimeType = @"image/jpeg";

GTLDriveFile *driveFile = [[GTLDriveFile alloc] init];
NSString *title = [NSString stringWithFormat:@"%@ - %@.mp3", file.artist,    file.songTitle];
driveFile.title = title;
driveFile.mimeType = @"audio/mp3";
driveFile.parents = @[parentRef];
driveFile.thumbnail = thumbnail;

AVURLAsset *songAsset = [AVURLAsset assetWithURL:file.assetURL];
[self extractDataForAsset:songAsset withCallback:^(NSData *data, NSError *error)
{
if (error == nil)
{
GTLUploadParameters *uploadParameters =
[GTLUploadParameters uploadParametersWithData:data
                                     MIMEType:driveFile.mimeType];

GTLQueryDrive *query = [GTLQueryDrive queryForFilesInsertWithObject:driveFile
                                                   uploadParameters:uploadParameters];

[self.driveService executeQuery:query
              completionHandler:^(GTLServiceTicket *ticket, id object, NSError *error)
   {
   if (error == nil)
   {
     completion(nil);
   }
   else
   {
     completion(error);
   }
 }];
}
else
{
  //handle the error. notification that the upload has failed.
}
}];