If you are submitting a shipment with full commodity information for the commercial invoice, but the commercial invoice is not printing then your UPS account is likely setup for paperless invoicing.
Shipping labels for paperless invoicing will include the letters "EDI" in the lower right hand corner.
If the label says "KEY" or "INV" in the corner then you must include printed international paperwork. If you are getting a label with "KEY" or "INV" in the corner and are not getting a commercial invoice, contact your UPS rep to make sure paperless invoicing is setup for your account.
Here are the descriptions of indicators you may see on the UPS shipping labels:
EDI: Paperless shipment where no paper invoice is required
EDI-CC: Paperless International (World Ease) Global Consolidated Clearance
EDI-DOC: Document shipment, Paperless or Non-Paperless
EDI-IDIS: Paperless or Non-Paperless customer uploaded invoice and/or additional documents for shipment
EDI-PULL: Paperless shipment where no paper invoice is required and the shipper intends UPS to pull other clearance related documents from the pouch and process at the origin
INV: Non-document shipment where paper invoice is required and all information, including invoice line detail, is keyed. Pull the customs copy of the Commercial Invoice.
INV-CC: Non-document GCC (WorldEase) shipment that contains invoice line detail from the shipping system
KEY: Non-document shipment where paper invoice is required and shipper did not data capture invoice line detail or critical information is missing