Hi there, @MEALSO.
I recognize the challenges that you've encountered in your business about migrating your attachments.
Currently, In QuickBooks Online (QBO) we don't have the option to simply the migration of your attachments from QuickBooks Desktop (QBDT). I recommend submitting feedback to our product developers team for this feature.
For now, what we can do is look for a third-party app for migrating your attachments with QuickBooks Online.
I'll include this article to help you understand more about how your QBDT was moved to QBO: Learn how features and data move from QuickBooks Desktop to QuickBooks Online.
If you have additional questions about migrating, you can always click the Reply button. I'm always ready to help.
