how do you change or edit a document that has been sent out for signature, without having to delete and re-upload it?

But the new feature update says this:

Powerful new capabilities for Senders

• New send agreement experience—Give senders more control over the signing process with a new, easy-to-use Send experience.

• Hybrid routing order—Get documents signed or approved in exactly the right order—let senders specify sequential or parallel routing—or use a mixture of the two.

• Delegator role—Easily route documents when the signer’s email is not known or an intermediary is needed— require participant to delegate signing to another person.

• On-the-fly document correction—Save time when the wrong document gets accidentally sent—let senders fix a signing request without cancelling and starting over.

So what does On-the-fly document correction really mean then?