Hi kent,

Thank you for bringing this issue to our attention. It's my priority that you're able to update your bank in QuickBooks Online (QBO).

There aren't any similar cases about the Update button is missing on the Banking page. If you're manually uploading transactions without connecting your bank, the Update button won't show up. Otherwise, let's try some basic troubleshooting steps to help you get back on track.

Please try using a private browser or Chrome's incognito window. This helps us determine if the cause of the issue is the browser's cache.

• For Internet Explorer or Firefox, press Ctrl+Shift+P. 
• For Chrome, press Ctrl+Shift+N.
• For Safari, hold down Command+Shift+N.

If you have the Update button using the incognito, please go back to the regular browser and clear the cache. You can check this article that will walk you through clearing the browser's cache: Clear the cache and temporary Internet files.

The above steps should help you fix the issue you're having right now. If you need more help with this, please let me know. I am here to help.