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The best method to upload products from Shopify to Amazon depends on your needs, but the most efficient way is using the Shopify Amazon integration app, which allows you to link your Shopify store with your Amazon Seller account and sync product listings, inventory, and orders. If you need more control, you can export your product data from Shopify as a CSV file and upload it to Amazon via their bulk upload tool, ensuring you map the fields correctly to match Amazon’s template. For a more automated approach, third-party tools like Codisto, Listtee, or SellBrite can help manage multi-channel listings efficiently.