

I have a few devices that serve this purpose. The one I’d recommend is Kodi. This is a non-commercial media center program that has one purpose in life: play media files on the TV.
IIRC you can buy some commercial devices that come with Kodi pre-installed, with a USB port. You could also set up a shared network folder. I haven’t researched any of these.
What worked best for me was a raspberry pi with libreelec installed – an operating system that makes it easy to run Kodi. You can even control it by default with the TV’s remote control, just through the HDMI connection. Make sure you have a good quality power supply.
The other thing I’ve used is a steam link, but it is a little clunky to get it to play smoothly over the network.
One question, do you know if the onn sends data back to Walmart? Not necessarily a deal breaker but important to know.