Mi TV 3s 60 Inch Application move to USB flash drive

Hello.

In my Mi Tv 3s 60 inch, i used the Move application to USB drive function. the application move successfully, however after restarting the TV, the Application is deleted from the TV and also the USB flash drive looks empty.

can someone please help with this issue? i have gone to the Xioami Shop in shenzhen to ask about this but they dont understand... despite i explained to them in Cantonese.