How to populate concurrent program parameter with value from spreadsheet?

Hi, I've been fighting my way through creating an integrator that uploads data to an interface table and then submits a concurrent program (asynchronous) to process the uploaded data.  The layout I'm using has an attribute in the header section named UPLOAD_FILE_NAME.  I would like to use the value entered in that attribute as a parameter value in the concurrent program submission during upload.  It seems logical that on the "Importer: Concurrent Program Request Submission" page I should be able to set the source for the concurrent program parameter to "Import" and then set the Value to UPLOAD_FILE_NAME.  But when