The method for Alibaba sellers to upload products is as follows:

1. Enter the Alibaba seller backend and select "Product Management".

2. Click "Create a New Product" and fill in the basic information of the product, including product name, size, weight, material, etc.

3. Fill in the detailed specifications and description of the product on the product details page, and you can upload product pictures, videos, etc.

4. Fill in the product price and transaction information, including sales unit price, minimum order quantity, delivery period, etc.

5. Select the appropriate transportation method and payment method.

6. Click the "Publish Product" button and the product can be put on the shelf for display.

Note: When uploading products, you need to ensure the authenticity and accuracy of the product information to avoid unnecessary disputes. In addition, you also need to pay attention to policies and regulations and the provisions of the Alibaba platform to prevent violations.