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Welcome to the Community, @usereastsideupc-offi. Glad you've got your checking account linked with QuickBooks. QBO automatically downloads the last 90 days or more of transactions from your bank.
I'd be delighted to help you add some earlier transactions manually from December 2019. Here's how:
Once done, go back to QuickBooks to upload these transactions. Here's how:
Once done, select Let's go. Your December transactions are now added to your checking account. You're now ready to match and categorize the transactions to make sure they're added in QuickBooks.
For future reference, I'm also adding an article: Fix bank upload errors in QuickBooks Online. It'll guide you in case you'll encounter issues when uploading bank transactions into QBO.
Feel free to visit again should you have additional concerns. We're always delighted to assist.