Hi there, Carolan. I can help you in updating your transactions in QuickBooks Online (QBO).
 
Please know that QuickBooks will only download transactions from your bank account within 90 days. However, some banks let you set a date range for downloads. This may be 30, 60, 90 days, or more depending on the financial institution.

Since there are missing transactions in your QBO account, I recommend contacting your bank's support to see if there's any maintenance happening at Coast Central Credit Union Bank.

For the time being, I'd suggest recording the missing transactions manually through QuickBooks depending on what type of transaction you have, and ensure to match your bank statements. In case the missing transactions are uploaded back to your QuickBooks account, you can match the duplicate transactions.

I'd also recommend contacting our QuickBooks Online support team to check if there's any possible issues regarding Coast Central Credit Union bank. Our support has the ability to check your account details and create a case if there's any INV about the missing transactions in your bank.

I've also added a screenshot for your visual reference.

In addition, you can also refer to this article to learn how to categorize bank transactions in QBO: Categorize online bank transactions in QBO.

Comment on the post if you are still encountering challenges in your bank transactions. I'm always here to help.