Since the new update on my iPhone split transactions won’t categories - An error message- An unexpected error occurred while accepting your downloaded transaction.

Since you started receiving this error after a recent update, let’s try some app troubleshooting steps to resolve the issue.
 

1. Make sure your QuickBooks app is updated to the latest version from the App Store.
2. Close the app completely, then reopen it and try again.
3. Restart your iPhone and try splitting and categorizing the transaction again.
4. If the issue continues, uninstall and reinstall the QuickBooks app, then sign back in.
    

You can also try splitting and categorizing the transaction through a web browser to check if the issue is limited to the mobile app.
 

if you have additional questions, feel free to reply to this thread.