If you plug in your USB and see an error, check these three critical areas:

Supported formats generally include H.264/AVC , MPEG-4 , and HEVC (H.265) .

For MP4 containers, use AAC , MP3 , or Dolby Digital .

If the TV's internal player is struggling with the file, consider these superior alternatives:

Instead of using a USB stick, host the file on your PC using Plex. The LG Plex app can often handle more complex streams by transcoding them on the fly. External Players: Devices like the Nvidia Shield Pro Go to product viewer dialog for this item. or Amazon Fire Stick 4K Go to product viewer dialog for this item.