You can ship directly from China factory to Amazon FBA, but it is costly and difficult to follow up shipping status, so it is better to ship from the China freight forwarder, ask China factory to paste the label of product SKU and carton FBA label in advance, then China freight forwarder will prepare the import and export custom clearance documents, goods shipped out by your confirmed shipping methods, local truck company or courier will deliver the goods to correct Amazon FBA warehouse after import custom cleared.