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In QuickBooks, we can't convert invoices from desktop to online.
Instead, here's the list of data you can import to QuickBooks online:
You can also consider searching an integrated application to help you convert and import your invoices. Just go to this link and search for an app: https://apps.intuit.com/app/apps/home
I suggest sending the same message to our product developers. Messages sent will be considered for future product update. Just click the Gear icon and choose Feedback.
It'll be my pleasure to help if you have any other questions.