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Open a QBO account
https:// quickbooks.grsm.io/UShttps:// quickbooks.grsm.io/us-promo
then open your QB Desktop company file. Go to File > Utilities > Copy Company File For QuickBooks Online to proceed. If you are using QBD 2017 or older, utilize the trial license of QBD 2021 to convert your file and migrate to QB Online.
Did you encounter any error?
Which version of Quickbooks are you using? You will need QB 2018 or higher.