You only need to produce exactly what they ask for. This way it will show them also if you can follow directions or not

If they ask for it, submit it, if they don't, don't. However, if they want additional docs/verification they will ask for it later. So, to have your own records up to date and available and in your records, it's a good time to spend the time to complete your dossier as you never know what the future holds. I still have all my tax returns that I've ever filed (first one was in 1967). Where possible I have letters & testimonials or other forms of verification of my employment history. I also have all my documents scanned and several copies made and kept in different locations. It's easy to do and incremental additions means you are covered for any eventuality.