Problems with brand new 1TB usb stick

after loading fat32 file and formating the usb stick (using windows 10),when iv tried copying movies (that do work on other smaller usb sticks),it takes a while copying the movie over like normal, iv then checked the data has been copied and showing. once i remove the stick to play on my tv its either not showing at all, or its there but go to play ,but then displays error file type is unsupported etc. then when i plug back in the usb in my desktop it will show nothing (no memory/data) is there. empty???

please , please please can some one help, im no wiz kid when it comes to dam computors,so please keep it simple. thanks