I got you, Christine-cicmed. Let me help you with resolving this banking issue.
QuickBooks Online is a portal. We're dependent on what your bank shares with us.
To import older transactions, you have two ways to do that:
Once they're imported, you can categorize and match online bank transactions in QuickBooks Online. Then, you can do your 2020 taxes.
If you have further questions, feel free to leave a comment below. We'll get back to you as soon as we can. Take care!