Sims freeplay duplication glitch

So sorry for my horrible explanation so here are the steps...
1.make the rooms seen in the video
2.place a double door on the right side of the 2 by 2
3.go into rooms and swipe up on the 2 by 2 then swipe down
4.take the door and put it on the left side
5.go into rooms then swipe up on the 2 by 2
6.if the door is in the middle then take another double door and place it on the left side
7.go back into rooms and swipe up on the building
8.if there is only one door in the middle go back in to rooms AGAIN and swipe up
9.if the door is red you did it right now just go BACK into rooms and swipe up 3 times on the 2 by 2
10.in the 2 by 5 place a 1 by 1 object in the top right corner and the bottom right corner
11.take one of the double doors that you duplicated and place it in the bottom right
12.go into rooms and swipe up on the 2 by 5
13.the door should now be in the middle of the objects
14.take the object in the bottom right and drag it in the top right object
15.for iPhone:Press the green arrow. For iPad:the little gray button in the middle of the bottom
16.it should now be red in the BOTTOM RIGHT
17.go into rooms and sipe up on the building 3-4 times
18.exit and just keep adding those duped items to inventory
Sorry for stuttering so much :)