You can customize the branding of your custom mobile app by uploading your own images as a single .zip file.
The package that is used in the simplified use case contains the following directories:
android - Contains a group of drawable-<resolution> folders that store splashlogo.png graphics used as splash screens for different screen resolutions, and the notification_icon.svg file, displayed in the notification bar when the location services are active.common_assets - Contains the icon.svg file that is displayed on the desktop, both in Android and iOS devices.
ios - Contains the splashlogo.png file that is displayed as a splash screen, and the Icon-72.png file that is displayed on the Mobile apps form.
Any other directories are not related to custom branding.