SKULabs does not support the import of "Draft" orders from Shopify. Draft orders are not pending payment or ready for fulfillment.
You must first "Complete" a draft order to import it into SKULabs...
According to Shopify documentation you will need to "Accept Payment " then "Mark as pending" if you are "awaiting payment for the current order". This converts the order to an unshipped pending payment order.
Otherwise, "if you aren't ready to accept payment yet, then you can save the order as a draft and accept payment later."
Completing a draft order: https://help.shopify.com/manual/orders/create-orders#find-or-complete-an-existing-draft-order
Accept Payment (even if only pending): https://help.shopify.com/manual/orders/create-orders#accept-payment