How do I import several MP4 files that constitute an audio book into iTunes so I can synchronize it with my iPhone?

I selected Audio Books, and tried to drag & drop the folder and files into the window, but it did nothing. I tried to select File > Import Folder and Import File and it still did nothing.

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C:\Users\Chloe\Documents\Audio Books\A Course in Miracles>ffprobe -hide_banner "A Course in Miracles - Preface - Ch 8-5hWJN4J-nyI.m4a"
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'A Course in Miracles - Preface - Ch 8-5hWJN4J-nyI.m4a':
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.12.100
  Duration: 08:47:56.78, start: 0.000000, bitrate: 129 kb/s
    Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
      handler_name    : SoundHandler

iTunes Version

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