Android recently update

I'm using Samsung Galaxy S7 Edge,i it had an update of the Android Function!! My gallery are all gone.. All the previous function that I'm using are all gone.. I can't edit the video I have and also edit the photo I have.. I really don't understand why Android want want to change to this stupid version?? I'm really regretted using Android phone for all this time.. When I get my paid, I will throw this stupid android phone away and change to an Iphone..

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