To test the effects you build in Spark AR Studio on the Spark AR Player app, you'll need:

• An iOS or Android device
• A USB cable
• A computer with AR Studio installed
• A saved project

To test your effect:

1. Connect your device to your computer
2. Open the app on your device
3. Open your project in AR Studio
4. Click Mirror in the Toolbar

The Spark AR Player app stores a version of your effect whenever you click Mirror in the Spark AR Studio Toolbar. This means you can view effects that you've mirrored on your device previously, without being connected to your computer or the Internet.

Yes, if you're offline, you can still view effects that you mirrored with the Spark AR Player app previously.

To toggle between versions of your effect:

1. Tap the menu in the top left
2. Select the effect
3. Select the version and tap Done

The Mirror button in Spark AR Studio is grayed out unless a mobile device is connected to your computer via a USB cable.

If you're having trouble previewing your effect with the Spark AR Player app, make sure:

1. You have the latest versions of both Spark AR Studio and the app. If the tool and the app versions are incompatible, you won't be able to mirror your effect.
2. Your device is connected to your computer via USB cable correctly.
3. You've clicked Mirror in the Toolbar.