Hey there, BDAmac.

Allow me to share additional information regarding moving your QuickBooks for Mac data to the online version.

To ensure you can move all your records from 20 years, you'll want to make sure your targets don't reach the limit. The file must be less than 350,000 targets.

Here's how to check the target limit:
 

1. Open your QuickBooks Desktop company file and access Product Information:
   • Windows: Press F2 on your keyboard.
   • Mac: Press CMD (?) +1 on your keyboard.
2. Check the Total Targets number.
   

Here's an article for more details: Condense your QuickBooks Desktop file for import to QuickBooks Online. Even if this article is for QuickBooks US versions, the same principles can be applied to your International account.

You can take a look at this write-up to know more about the converting process: Move your QuickBooks Desktop file to QuickBooks Online

Let me know how the result of this troubleshooting in the comment below. I need to make sure this is resolved and you're able to convert your file. Have a good one.