Hello there, pwalker130.
Let's make sure that you have downloaded your last year's statement in a file format that QBO supports.
You can use any of these file formats:
If not, you can either convert your file via QuickBooks Online third-party application or manually create a CSV file.
In connection with this, you can check this article on how to upload more than 90 days of bank transactions.
You can get back to us if you need anything else. We'd be glad to help you some more.