Best way of installing and configuring MiniDLNA on Manjaro?

First I would recommend to add the HDD to /etc/fstab for mounting on boot.

Then please read the man page:

man minidlna.conf

There you see:

       media_dir
              Path to the directory containing the media files minidlna should share.
              Use this option multile times if you have more than one directory to share.

              Example:
               media_dir=/opt/multimedia/videos
               media_dir=/opt/multimedia/movies

       You can also restrict an entry to a specific media type, you do this by using the following syntax:
          the letter 'A', 'V' or 'P', followed by a comma (',') followed by the path.
          The meaning of the first letter is as follows:
                             'A' for audio files
                             'V' for video files
                             'P' for image files

           For example, if you want to include only video files located
           in /opt/multimedia/videos directory, and only music
           in /opt/multimedia/music, then you would use
                              media_dir=V,/opt/multimedia/videos
                              media_dir=A,/opt/multimedia/music

           Another example would be
                              media_dir=V,/opt/multimedia/videos
                              media_dir=V,/opt/multimedia/movies
                              media_dir=A,/opt/multimedia/music

           Or, if you did not care what type it finds, then you could use
                              media_dir=/opt/multimedia/videos
                              media_dir=/opt/multimedia/movies
                              media_dir=/opt/multimedia/music

           You can mix it up, find anything in music, but only Videos, in videos and movies
                              media_dir=V,/opt/multimedia/videos
                              media_dir=V,/opt/multimedia/movies
                              media_dir=/opt/multimedia/music

That should explain it and edit the file /etc/minidlna.conf

After restarting the service, it should be applied:

sudo systemctl restart minidlna.service
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