We suggest you to add new products and stocks in Xilnex, and sync to Zetpy then to marketplaces. So that the product details are completed on Xilnex, Zetpy Xilnex plugin and also in Zetpy products page.
For existing Xilnex client, you can choose to import all or selected existing products (those items that you want to sell on e-commerce) from Xilnex into Zetpy.
Once the items from Xilnex are imported successfully to Zetpy, all items will appear at this Products page. This is where you can add or edit the product info (such as Product Name, Description, Price and Image) before pushing the item to marketplaces.