I am trying to specify to have some product variants be auto-added via Shopify Flow.
What I have done is:
Start when: “order created”
Check if: “tags is equal to add_extra_product”
Do this: “Add order line item”
At the right panel, I am trying to specify “Product variant GID” with the existing product variant, but it always throws an error “This value is not a product variant GID”.