QB Issue Resolution:

CSV files that came from banks must contain the bank details. If it doesn’t have the check numbers, you can edit the file to include this information and re-import it. Please do the same thing if you’ve manually created this file. Here’s how:

  1. Open a new Excel file.
  2. Click on File.
  3. Choose Open.
  4. Select the .CSV file saved on your computer (came from the bank).
  5. In the Description column, add the check numbers.
  6. Click on Save.
  7. In your QuickBooks Online account, go to Banking and choose File upload.
  8. Browse the file and click on Next.
  9. Choose a bank account and click on Next.
  10. Map the CSV columns and click on Next.

Go back to your For Review page. Make sure to exclude and delete the duplicates to avoid confusion. Here’s an article for your reference: How To Import Bank Transactions Using Excel CSV Files.

Resolution for Issue 'When my bank download my transactions it used to have the check numbers with it but when I upload my csv it doesn’t why is that?' available: Yes (Solved).
Source: Intuit Community forum.

When my bank download my transactions it used to have the check numbers with it but when I upload my csv it doesn’t why is that?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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