One of the most popular email services, Gmail keeps track of all your emails with threaded conversations, tags, and Google-powered search to find any message you need.
Send approved agreements for signature and give requesters a view link.
Your signer gets a private link to sign the agreement. Your coworker gets a separate link to view the request.
Put approved agreement PDFs before managers for online signing.
Your agreement reaches the named manager for online signature, and the requester gets a confirmation in the email thread.
Send final agreements for signature and confirm the request ID.
Your final agreements reach the signers you list, and you get a reply with the invitation details in the original email thread.