Hi scott-sanchez3,
I'm sharing the article with step-by-step instructions to connect your AMEX credit card account to QBO. Please check this out: Connect your American Express Business account to QuickBooks Online.
If you're getting an error message or code, please search it in the Community to find the article for it. Or, you can comment it below, so we can help you find the steps to resolve it.
You can also check about reviewing and categorizing downloaded transactions for your reference in the future.
We're just right here if you need anything else.