Don't worry. I'm talking about the documents such as let's say for e.g. you have to upload your work experience certificate or your resume, driving license, tax returns etc etc. then you can mail your CO these copies instead of attaching it online on immi site. Make sure you send them colored scanned copies.
In my case online it said Required national identity document other than passport, so I already attached (Driving License) it and till today's date it says Required. I just mailed my CO the colored scan of my Driving License that's it. You can also ask your CO if it's not uploading and then he will ask you to send him/her in mail.
Now for your medical case all I can ask you is, if you have your Medical receipt where your medicals were held then just attach the receipt and mail your CO. he will track down your medical and will let you know. In the mail do write that please track my medical results and let me know if you have received it or not ? Your CO will get back to you.