I received a response from the developer. See below...
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If we press "Options", we see the "Reverse Sync Options".
Here we can choose:
Upload MP3s
Delete After Upload
MP3 Folder Name --- This is the folder name that has MP3s we want to add to our iTunes library. The default is "AmazonMP3".
Upload playlist name --- This is the playlist that uploaded songs will show up in in iTunes
Upload Path --- This is the path to put the MP3s inside on your personal computer.