The splash screen appears when your app is loading.
Splash screen properties
Background color: The splash screen’s color.
Image: The foreground picture on your splash screen.
Image size: The display pixel size of your image. The maximum size depends on the platforms your app might be installed on and cannot be exceeded.
Submitting changes
Splash screen changes can't be published immediately. They need to be reviewed by Google and Apple before publishing. Let us know if you have changed your splash screen post-launch and want us to resubmit it for review.