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Plex app on Roku vs on LG C3

I have the latest Roku ultra.  When using Plex to stream my SDR content on my new LG C3, it looks terrible. It's unwatchable. 


However, viewing that same content through the Plex app installed on my TV, the SDR content looks good. 


I'd like to keep my Roku ultra because I'm familiar with it and I've been using one for many many years. However if I can't get this to work then I will have to return it and get used to using the webos on my LG C3.  


All my components are connected to my Onkyo rz50.   My Plex content is stored on a Synology Nas.


Any insight would be greatly appreciated. Thank you! 

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