Soundiiz is able to import multiple playlist file formats and also plain text directly.
For the CSV format there's an header line to have to be sure to working well with Soundiiz system.
Also you must use ";" as delimiter for your values.
When importing a playlist as CSV file
title;artist;album;isrc;
Only the "title" field is required, leave empty other fields if you don't have the value for it.
When importing an album list as CSV file to your favorites
title;artist;upc;
Only the "title" and "artist" fields are required, leave empty other fields if you don't have the value for it.
When importing an artist list as CSV file to your favorites
name;
The "name" filed is required
When importing a track lists as CSV file to your favorites
title;artist;album;isrc;
Only the "title" field is required, leave empty other fields if you don't have the value for it.