Steps to Add Attachments in Service Sheet/Invoice Document

Login into the Ariba Supplier Site. You can directly login via link provided in the PO mail or through this link https://supplier.ariba.com/

 Navigate to PO. 

Click: "Create Service Sheet" or "Create Invoice - Standard Invoice" as per the business process. 

When the next screen is displayed, if it is the "Create Invoice Screen", then on the right top of your screen, click on "Add to Header" --> "Add Attachments".

In the whole page, lookup for the attachments sections.

Click on "Choose Files".

This should should your system's files. Navigate to the relevant file that needs to be uploaded. You can attach one document at a time. 

Then click on "Add Attachment".

If there are multiple attachment then keep repeating the instructions from step 6.