Hi Karen,
I know that online banking is an important feature to help us make our work faster. I will help you get this sorted out.
If you get an error code or prompt when trying to connect your account, you can search for it in the Community to find the article with steps to resolve it or comment below and we'll help you with it. You can also contact your bank to check if they have maintenance on their online banking service.
Regarding importing transactions using a CSV file, please provide details on which part you are having challenges. You can try to import transactions in batches if you have many of them. See about common errors when importing transactions using CSV as well.
Thank you for any additional details.