InkGo uses a combination of line item properties and note attributes to store the personalization data in the Shopify order.

In EZ Exporter, you can use the formula below in the Calculated Fields to extract the thumbnail image URL for each line item in the Shopify order:

get_attribute_value(search_attributes({{ note_attributes }}, "inkgo_" + search_attributes({{ line_items.properties }}, "_inkgo_custom_id")), "thumb")