The Unity Reflect Viewer opens with a splash screen of the Unity Reflect logo while playing an audio clip. This is the first interaction with the viewer and provides a great opportunity for adding your own branding. The Reflect Viewer Prefab gives you full access to all of the elements in the splash screen so you can change it without resorting to coding.
Note that the sequence, timing, and triggering of the splash screen is controlled by the “Splash” script in the Reflect Viewer Prefab. For more advanced customization, you could edit this script.