Capture ID of SharePoint document library when adding a new document IN BACKLOG

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When adding a new list item into a SharePoint list, you have the option in BPS to capture the ID of the new list item you have added. Then it is easy to add attachments to this list item using that ID.
When I add a new document to a document library, the listID capture option is disabled. It would be really helpful to be able to capture this list ID for a document library as well so that then I can use that to add custom meta-data to the document library for the document I have just copied to SP.