Hi,
The easiest way is to play the movie on your desk top or iPhone, and use the mirroring feature on your device to mirror the movie on your TV screen. On older TV’s you would need Apple TV to make the mirror connection but I believe the newer TV’s have the built in capability to mirror.
Another way is to put your movie on a thumb drive that is formatted ExFat. Then plug it into your TV. You should be able to play the movie on it. No guarantees, of course.
You can also plug your Mac into the TV with a HDMI cable, and then play the movie on your desk top and it will mirror on the TV screen.
— Rich