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I can't move my apps to the memory stick 
Plz help me
P/s: my phone is Sony Xperia Z2
Hi @JK97, welcome to our forum!
You can't move application to a memory stick (USB stick), are you trying to move them to an SD card?
Do note that all applications can't be moved to an SD card as it is up to the developer of the application if this is available or not.
You can check in Settings > Apps > name of the application > Storage. Here you should have a button called "Change" if the application supports being moved to an SD card. If it's not present, the application can't be moved to the SD card.
Let us know how it goes!