Method Community

I am importing an update of my customer info in Method, but each time I update a customer, I dont see the changes reflected in Quickbooks Online. Please help!

If yes, where do I learn more about it?? 

I currently use QBooks Online to email my invoices. After creating the invoices and saving them, I filter the transactions by date and email them in batches. I realize that once I change the QBooks contact list through uploading to method, my ability to email invoices through QBooks will be impared - as I will only have one single email address ...