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Let me help you sort this out, @camdown.
Sharing your transactions to QuickBooks will depend on your bank. You may want to check for any connectivity error prompt within QuickBooks.
If there's none, you can log in to your bank's online website and check for any errors or notification that needs your attention.
If none, lets manually update your bank's connection with QuickBooks.
You can check this article if you need to review your downloaded transactions: Match and categorize bank transactions in QuickBooks Online.
Please let me know if there's anything else I can assist you with. I'd be happy to help.