NOTE: Updating your product images will automatically update the images in your linked listings. You don't need to take any further action to update your listing images. If you are looking to update your product images in bulk, so you can this using a CSV file, or by uploading a Zip file of your images.
Updating images for a single product (non-variation)
To update a product image, navigate to Products > Inventory, then select the product you wish to update. From the Product page, click on the 'Images' tab.
On this page, click 'Choose Files' to upload product images locally from your computer. Click 'Save' when you are done.
Updating images for a variation product
To update images for a specific variation, navigate to Products > Inventory. All variations will be displayed individually on this page.
Alternatively, you can find you variation products by navigating to Products > All Products and clicking on the parent product. Once on the parent product page, you can click into the 'Variations' tab to add images to your variation products.
From the variation product page, simply click 'Choose Files' to upload your product images. Click 'Save' when you are done. You can also update your parent product images using the same process.