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You can manually download transactions from your bank's website and import it to QuickBooks. Let me guide you how.
Please refer to this article for details: Manually upload transactions into QuickBooks Online.
Once done, reconcile your account to ensure your books are accurate and no duplicate transactions. I've also added our page about banking and bank feeds for your reference.
Stay in touch if you have other questions or concerns. I'd be delighted to answer them for you. Thanks for coming in to Community and take care.