Otherwise you may undo your case quantity fixes if you end up importing these mismatches.!
First, products are matched based on a (default 'vpn') key.
Then, these matches will be compared based on a secondary (default 'caseqty') key. New mismatched spreadsheet data will be identified.
Large file uploads will take a while to process, depending on your internet connection and server load. You can set specific columns to use for matching. The default columns are listed below. Change to suit your needs.