Why is my Attribute List empty?

Our plugin’s “Attribute Mapping” list is generated from WooCommerce / Shopify / BigCommerce or other cart software attributes. One must create attributes (via Products > Attributes) and link them to WooCommerce products for the mapping to succeed.
See WooCommerce_Attributes

Also, if you are creating your product feed for Shopify or BigCommerce based stores using our Cloud Service, it is a rare case that your shop sync was incomplete. Please let us know in this case and we’ll add your shop in the sync schedule or check if there was some other issues.