LG TVs typically only recognize drives formatted to FAT32 or NTFS . If your drive is formatted to exFAT (common on Mac/newer PCs), the TV will not read it.
This file name, , appears to be a specific media asset related to high-definition display demonstrations or technical tests for LG televisions , likely belonging to the LG NanoCell 73 series (indicated by the "73S-A-lg" naming convention). SEEGASM_73S-A-lg.mp4
If the TV's internal player is struggling with the file, consider these superior alternatives: LG TVs typically only recognize drives formatted to
Supported formats generally include H.264/AVC , MPEG-4 , and HEVC (H.265) . and HEVC (H.265) .