• The sync date is incorrect
• Accounting Period is in a period before the paycheck date
• Paychecks have the wrong or no date
• Paychecks have no check number 

The Sync Date will default to the date since the last successful update. If the paychecks have a date before this date, there will be nothing to upload.

1. Verify that the paychecks have the correct date.
2. Verify that the paychecks have check numbers.
3. Check your Accounting Period to verify that it’s correct.
   • It needs to be in the same period or later than the date of the checks
   • If necessary, change the accounting period
4. Upload payslips again and verify that they’re uploading now.