It's easy to set splash screens for iOS devices as iPads and most iPhones share the same dimensions for their displays.
Due to the fact that the world of Android devices and therefore different screen sizes are much bigger, it could be the case that an uploaded splash screen is generating margins on the screen (displayed in red in the graphic below).
A nice workaround to display a splash screen without these margins is to just set a background color and put a transparent PNG graphic file on top
In order to do this please go into App Design/Android/Basic settings in the Purple DS Manager. Here you can find the "Splashscreen" settings. Set your desired background color in section 02. and
upload your PNG files for portrait and landscape in section 03. and 04.
After clicking "Save" at the bottom of the screen and rebuilding your app margins on Android are history!