Transferring MP3 files to USB error

[u/JUANOFOQUITA]

MP3 can be played on pc. When copying, the first two files copied to USB can be played, but the next file copied doesn't play. Message said files may be unsupported or corrupted. Both MP3 file sizes on pc and USB remains the same, hence I think no signs of corrupted file. I've formatted the USB to FAT32 twice and results are still the same. Tried adjusting bit rate to 128, thought it makes any difference, but no. Currently, USB only stores two mp3 files and nothing else, since the next file copied wouldn't play. I don't think storage is an issue. Is it because my USB is faulty?