One suggestion break it into the smaller pieces and upload them. and later merge them into one.
And you are not mentioned what the issue you are facing while doing this.
"If you share your assets (money etc..) it will decrease, But if you share your knowledge it will increase!!! ".
what we need to is , at web.confg file you need to add below keys so that it can allow to upload more than 3 GB
hope it will help you to resolve your requirement