That’s strange as although my casting is limited to Plex it works absolutely flawlessly for me.
It’s my default method on the LG rather than using the remote.
I will try with youtube or something later on if I get chance.
Yeh, tried again today - On my phone if I try casting from YouTube to the LG TV, although it’s listed, it fails (when using the USB adapter).
If I plug the ethernet cable in normally to the TV, and initiate the cast (in youtube on my phone), youtube starts on the TV, and the video plays.
It’s as if the starting and stopping of youtube (casting) is literally hardwired to the TVs recognised network inputs (wired and wireless), because when using the dongle, the network settings reports no wired or wireless connection 
I’ve email LG support in the hope they can maybe do an OS fix or the like, but ultra unlikely.
ps: As regards the stutters to varying degrees I mentioned, is that a known issue with LG Plex and Dobly Atmos audio?
I’m not 100% sure but I seem to recall something about True-HD on the whole didn’t play nicely with any kind of subtitles in the LG app.
Have you turned off secure connections in the app? Having it on is one possible cause of constant buffering.
I’ll ensure it’s turned off then - https://support.plex.tv/articles/206225077-how-to-use-secure-server-connections/
But TBH I think where I’m encountering it, it’s due to a large file size, and it simply burthing the ethernet port, plus maybe something to do with Dolby Atmos etc?
TrueHD audio tracks won’t direct play so may be forcing a transcode. Try selecting a different audio track to see if that helps. I can play 4K movies on my LG C6 without any issues using either the Ethernet port or wireless as long as everything is direct playing.
I can play media from Plex fine from all sources, as long as the bitrate on them is not too high.
As a rule of thumb, once a file gets beyond 25-35GB in size, the data rate will then risk bursting what the TV’s 100mbps port can handle.
IMHO.
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As I said, my C6 model can manage playing 4K files (which are pretty much all bigger than the size you state) without problems. I’d double check that everything is direct playing and secure connections are off. If that didn’t help then give the WiFi a try?
Did you try casting YouTube from your phone to your TV? Can you confirm the USB adapter means it (youtube) won’t start up correctly on the TV?
I hadn’t but you just jogged my memory.
YouTube casts fine from my iPhone 7 to the LG.
EDIT. Whoops my bad. It was actually casting via AirPlay to the AppleTV.
No it doesn’t even detect the LG TV at all.
I have an OLED65E6P and Plex streams just fine. I’ve only watched up to 79GB MKV UHD-HDR files, but I think that’s pretty good proof that it works. TruHD 7.1 and ATMOS both work. The files won’t play over Ethernet though. I use wireless. The wireless AC-1900 router sits less than a foot from the TV. The router is connected via ethernet to a MoCA 2.0 adapter.
Here’s something to be aware of if you’re running your LG set (or any other set, maybe, for that matter) on WiFi: I’ve been tweaking my home LAN recently (to try and get better coverage throughout the house) and experimented with moving from a single AP providing an 80MHz 802.11ac network on ch36 to two APs providing the same network, but 40MHz on channels 36 and 44. (FYI, I can’t use DFS channels here as we’re very close to an airport and weather radar knocks the radios offline within minutes of them coming online).
The PHY rate on the TV was still around 400Mbps, but 4k content from Plex was buffered constantly and was unwatchable. I checked that the TV was still connected to the closest AP that’s connected directly to the ISP CPE (rather than the newly added one that’s on an EoP backhaul from upstairs) and it was. The movie in question was a relatively low bitrate Bluray rip/re-encode at ~44Mbps.
I turned off the additional AP, changed my old one back to 80MHz and the buffering ceased immediately. This makes no sense to me, but is reproducible. I’ll talk to my wifi engineer mate at work and see if he has any bright ideas, but in the mean time I can strongly recommend running your WiFi on 80MHz channel widths if you can.
TL;DR - WiFi is a lot more complicated than it used to be 
Your comment on running 80MHz width makes sense to me, I run my Wi-Fi that way as well, which I’m convinced helps run buffer free. Your experience would back that up.
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