Hello there, @dlaustin1979. I'd like to share some insights about importing CSV files to QuickBooks Online.
Although I'm unable to make suggestions, I advise looking for a file converter program outside of QuickBooks. Once the conversion procedure is complete, you may begin importing CSV into QBO.
Furthermore, there's an extra guide on how you manage your bank transactions after downloading them to QBO: Categorize and match online bank transactions in QuickBooks Online.
You can always get back to us whenever you need more assistance with banking or QuickBooks. We'd love to guide you through. Have a good one and take care!