Can OHS index PDF to Harvester Server?

OHS is perfect for harvesting metadata. We have journals at different websites and want to use OHS as a digital repository however, can OHS copy the PDF files to the server where OHS is installed instead of creating a link to the main website as Original Record

One thing more, OHS can not copy DOI from the main website however, it adds a link to the hervester website and then add DOI. Any solution please?