usb drive is not working on samsung TV when formatted on mac

Hi Apple Team

recently days i got a big problem

1) i have 32 GB storage usb drive when i use this drive for copy movie form my mac and paste in usb drive and watch movie and after finish watching movie

then i go to delete that movie from my usb using mac. i can delete movie but usb space is not going free Why?

2) when i formatted my usb using mac and then copy new movie video or file and paste it in usb drive and going to put on my tv its not showing on TV and not working at all on TV but shows on Mac and working perfectly on macbook

please give me