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On the Line Item List form or Supporting Document tab, at the bottom of the screen
Click > Import > Select >Import LI with attachments
On the Upload Files and Folders screen, click >Add
On the Open screen, browse to the folder that has the supporting file, select the file and click >Open
On the Upload Files and Folders screen continue adding files, then click >Upload
When the Upload Status screen indicates the upload is complete, click >Close
What is attaching a document to a Business Process record?