To add a gift, go to the bundle editor, open the Gifts tab, then:
A new gift bubble will automatically appear in the row.
You can then configure it however you want (Shopify product, shipping, or non-Shopify product).
Important: if you don’t see your gift in the preview, make sure it is enabled and matched to at least one offer in the bundle.
If adding the gift doesn’t work or it doesn’t display, contact MoonBundles support.