The variant images on the left-hand side can be imported
How do I import my existing variant images?
There are 2 ways:
When you open Variant Image Wizard for the first time on a product, you'll be prompted to add any existing variant images, as you can see on example 1.
You can also import your existing variant images at any time by using the multi-select functionality, shown in example 2.
Example 1: Configuring a product for the first time
As you can see below, simply hit Continue, followed by Yes.
Example 2: Importing after configuring your product
To import variant images at any time, simply select the variants you'd like to configure and click on the More icon (3 dots). Then, click on Import Shopify Variant Image, followed by Confirm.