I want to send everything by post. Do I need to upload anythingin the supporting documents section?

When sending documents by post, you will still need to confirm this on the relevant supporting documents upload page.

You will need to click the ‘Need to send a document by post?’ link, and choose the document type, give a description to the document that you are sending by post, and click ‘confirm’. You will need to repeat this process for each of the documents you are sending.