1. Check the audio format and confirm that the files in the USB flash drive are MP3 and WMA formats supported by the audio, and the unsupported formats will not be recognized
2. Format the USB flash drive to FAT32 format, and the capacity of the USB flash drive is recommended to not exceed 64G
3. Unplug the USB flash drive and reinsert it, check whether the USB flash port is in good contact
4. Check whether the USB flash drive is damaged, and the USB flash drive can be replaced for testing
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