You should give a copy to whoever is the person responsible in a each document. Don’t have your Will be a surprise to the executor.

I keep all of the originals in a fireproof envelope inside a gun safe in our basement. A scan of every document. Yes in a protected folder on a thumb drive with a trusted relative.

Most brokerages will sell to cover upon vest (before they release the remaining shares to you).

You have to decide if you want to sell to cover, or send a check to your HR.