nspuser

Just to add to my previous post, to help further automate the fix, I bought a smart plug for the hub/switch to plug into which is controlled from my Echo Dot, and I created a routine in the Amazon Alexa app to turn off the switch, wait 10 seconds, then turn it back on. So now if I'm sitting on the couch and if I see the cache hasn't refreshed I just say "Alexa, fix the tv" and 10 seconds later it's fixed.

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.