Downloading transactions from my quickbooks checking account

I use Quickbooks Online and Quickbooks Checking and all of my transactions are not showing up from March (when I opened quickbooks checking) to October of last year. How can I download a QBO file to upload them so my accountant can complete her bookkeeping and categorizing for 2021? I see all the transactions under my checking account, but not under banking within quickbooks. 

Seems silly that this is a question I need to ask, since they are both within Quickbooks. It should be more seamless!!