Why isnt my multi window working?

[AC Question]

hello everyone im new to the Samsung world previously owning a iphone 6 swiching to a galaxy note 4 current its running on android 4.4.4 and I followed the steps on youtube on how to use the dual screens and for some reason I enabled the setting in mulit window turned it on and then I get the side view pop up but when I drg the app to the top or bottom its not letting me drag it I can only use one at a time if you could help I appreciate It im going crazy

 

[Aqil Lee Chaelin]

Try to long hold the app

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