I have a LG OLED55C7 aswell. My app works fine. :-)
Which exact settings did you choose on sip******* WARNING FRAUD **DON'T BUY** PLEASE REPORT TO ADMIN ******* when uploading? Have you tried choosing "Various" and "Enable list logos" for example? And do you upload your playlist with a link or as a file? Have you tried both versions? You could also try...