You have to click the contracts and finances tab on the hub, then hover your cursor over that same tab and the document submissions option should be there. When the page loads click on the on the document type and choose subcontractor declaration which should prompt you to upload the file.
Does anyone know what the final “Document Status” should be for a successful return? It changed from “Uploaded” to “Received” after a few hours and has been like that for days but I notice that there are two other possible states for the filter on that column i.e. “Invalid” and “Valid”.
“Valid” sounds more definite than just the rather woolly “Received”.
I have logged the question with the help desk yesterday morning but I am still waiting for a reply.