That's mainly an issue to do with Whatsapp. Whatsapp is not optimized for every Android device. Since its too much work for the developers to make optimizations for each type of Android phone. As long as you take pictures with the phone camera and up...

1)Go to recent apps. (Either by swiping up from the bottom of the screen and stopping midway if you use gestures or just pressing the recent apps botton.) 2)Then click on the icon of the app you want to see in split. you see will the option for you ...