Google Drive is Google's file sync app that lets you store all of your files online alongside your Google Docs documents, and keep them synced with all of your devices.
Send approved agreements with fields for each signer.
Your signers get the agreement to sign, and you can see the request link and sent status on the case.
Check the approved PDF before inviting the agreement's signers.
Your agreement goes to the right signers in the order you choose, and the case gives its owner a link to the request.