Thanks for posting here in the Community. I'll be happy to help you with correcting your uploaded transactions.
If you've imported bank transactions using an Excel file, you can reverse the transactions by deleting the items manually in QuickBooks. Let me guide you through the steps:
Doing this will remove all the entries that are posted incorrectly. Once you're all set, you can now re-import the corrected file in QuickBooks.
I recommend you to check out this helpful article to know more about importing transactions in QBO: How to import bank transactions using Excel CSV files
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