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For those who like to read TV specs, and get confused about some of the abbreviations, here is a useful site: https://www.rtings.com/tv/learn/ips-led-vs-va-lcd

I have the same issue. I have a LG OLED65C8P and a Synology DiskStation DS218j NAS. I am sure that the TV is cacheing the DLNA contents because when I add a video file on the NAS side, I see immediate updates from other DLNA clients (e.g. Windows Media Player and a Samsung TV) but the LG TV LG WebOS doesn't show the new file and there is no refresh button in the TV to force it to update from the NAS. I found one workaround which works every time is to disconnect the network cable going to the TV while on the "Photo & Video" menu on the TV where you see your NAS device listed. After a couple seconds you see a message "Wired network cable disconnected" in the top-right corner of the screen, and about 5-10 seconds after that you see the NAS device disappear from the screen. Now reconnect the cable and you see the NAS device reappear and viola, it refreshed its cache. I've tested this many times and it works every time, both for adding new files and removing old files. Next step to simply the process I added a powered network hub/switch in between the TV and its internet connection that is plugged into a power bar (i.e. surge protector) that has a On/Off switch (no other devices connected to it). So when I need to refresh the DLNA cache I just turn the switch Off which powers off the hub/switch which causes the TV to lose its network connection, wait 10 seconds then flip it back On. I hope LG fixes this problem in the next LG WebOS update. The behavior like other DLNA client devices should be that it re-queries the contents of the current folder you are looking in real-time. Or at a minimum it should provide a refresh button that will let the user force refresh the current folder.

Maybe the player only fetch the files when it starts. You could 'kill' the player by clicking the X above it and try to restart it. Maybe that helps.

It's common for most DLNA-servers - when you just put a new file into the folder used by DLNA-server, the server doesn't rehash its database used for files management. At least it doesn't immediately by default. And if after putting a new file you try to watch video from the DLNA-server on your PC with help of VLC-player, you won't see the added file too. It means, that the problem is not in your TV. For making DLNA-server "know" about a new file in its storage you have to do some extra action. For example it could be done by pressing "rescan directories" button in DLNA-server web-intetface or something like this. With my DLNA-server it helps. After this you will have to restart video-player on your TV