As for this problem, I think maybe M4A files are incompatible with SanDisk Clip Sport. As I know, m4a files are encrypted named DRM tech. So, if you intend to transfer these songs to your Clip Sport, I recommend you can convert them to MP3 format with AudFree Audio Converter, which can help you batch convert your songs to MP3 losslessly. Besides, you can keep and customize ID3 tags to manage your library easily.
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