var media = new[]{
pathA,
pathB,
pathC,
};

await CrossMediaManager.Current.Play(media );
CrossMediaManager.Current.MediaQueue.CurrentIndex = 1;

var extractor = CrossMediaManager.Current.MediaExtractor

CrossMediaManager.Current.MediaQueue.Add(await extractor.CreateMediaItem(pathA));
CrossMediaManager.Current.MediaQueue.Add(await extractor.CreateMediaItem(pathB));
CrossMediaManager.Current.MediaQueue.Add(await extractor.CreateMediaItem(pathC));

CrossMediaManager.Current.MediaQueue.CurrentIndex = 1;

var mediamanager = CrossMediaManager.Current as MediaManagerImplementation;    mediamanager.MediaBrowserManager.MediaController.GetTransportControls().Prepare();