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.
Add contract terms and file links to the tracker for review.
Your team gets a linked tracker row and a contract summary to check when someone shares a readable contract file in chat.
Send approved contracts for signature and file signed copies with proof.
Your client gets the signature request, and your team finds the signed agreement with its audit page in the final folder.