I have an LG TV and it creates a folder on the flash drive itself that is used to remember where it left off. I assume it also remembers settings for subtitles and so on using that file. As long as I don't delete that folder it will remember all the settings even if I remove it from the TV. If I have multiple movies on the flash drive, the settings for each movie are stored in that file.
On my flash drive the folder is visible when I insert it into a usb port on my computer. If you can't see it, it might be a hidden folder on the flash drive.
Using a combination of keystrokes on the LG TV remote, I can move the cursor to any point in a movie and play it from there. I'm not stuck playing it only from the point where I left off. Bought the TV in 2018 so it's not brand new, but it's not ancient either.
Also, I have to "eject" the flash drive before removing it. The TV is not happy with me if I don't do that first.
. Warns me about data loss, etc.
Joe