How to see which records were skipped on import

How to see which records were skipped on import

I am importing leads into Zoho.  I get the status that the leads were imported and that 9993 were added and 6 were skipped. (Reason: Due to empty values for any of the mandatory fields)  But I don't know which 6 were skipped

I sorted my excel file that I started with and do not see any empty cells. 

When importing that many items it is important to know which items are skipped.  

Thank you!