Pretty cool how you offer this as a widget. 18 years ago I built a handy importer for CSV and tab-delimited files in a logistics company’s traditional Java web app with no JavaScript/AJAX, and it enabled the users to map columns in a multi-page workflow. CSV was new to me and of course all the edge cases were surprising, but on top of that all the data consisted of shipping addresses, and I was amazed at how many different ways address fields would be presented! So it definitely felt like a double whammy of CSV inconsistencies and address inconsistencies!