8 August 2012 at 14:32
There does not seem to be a mechanism for uploading more documents once you have already done so the first time. The two options at the moment are to wait for your return to be assessed again and SARS may ask you for more documentation in which case you can upload your IPR5 then. The other alternative is to drop all your documents at SARS so that they have records.
You could wait though because SARS should have a record of your IRP5 already and so would probably only require the medical certificate, so perhaps wait for the next assessment to see what has happened.