I would highly recommend getting all of the required information uploaded as soon as you can. Once you've lodged your application you can see through the immi portal which documents are required.
If you wait for the CO to request it, you're only going to delay your application as it won't be processed until you have provided all of the required information. I didn't even submit my application until I had all of my necessary information (skills assessment, health checks and security clearances) and I had my PR is just over 3 months.