Let me share some information to help guide you in reconciling your transactions.
First, let's make sure that your downloaded bank transactions are added into QuickBooks. Here's how:
Go to the Banking menu.
Choose the Banking tab.
Select the name of the bank account you want to reconcile.
From the For Review tab, mark the transactions.
Click the Accept button.
Once completed, you now start the reconciliation process. Here's how:
Hover to the Accounting menu.
Choose the Chart of Accounts tab.
Locate the bank account you want to reconcile.
From the Action column, click Account History.
Click the Reconcile button.
Enter the Ending balance and Ending date on your statement.
From the Reconcile page, click the Funnel icon.
Set the Date Range of the transaction.
Click the Apply button.
Now, you can see all of your transactions from January 1, 2021 and proceed to the reconciliation process. You can read through these articles for more detailed instructions: