3rd Party Imports to MEPW

We produce P11D's from a 3rd party software and our previous system allowed the PDF documents to be imported in bulk to an employee epay window. We would like to be able to complete this in Staffology, but at present this is not possible. The MEPW should be open to the import of any PDF document we would want to pass to the employee and we would need the ability to import a bulk file.