Hello there, @Mal47. 

Thanks for posting your question here. 

Since the steps provided by my colleague weren't successful, I recommend getting in touch with PayPal Support Team to ensure all troubleshooting steps have been completed and were not lumped in. For more information about adding transactions to QuickBooks Online, you can refer to the steps above. 

Feel free to comment below if you have any more questions. I'm always here to lend a hand and help. Take care!