Thanks for directing me to the troubleshooting doc! It looks like after I saved teh file as  Windows Formatted Text on my Mac the upload worked. Thanks!

I am trying to use the Classification Importer to classify values for a subclassification but after uploading my csv file, it says 'no rows were updated/affected' and when I look in workspace, the values were indeed not classified.  Below is an example of what I'm trying to classify. The Key values ...