Today, Dropbox featured HelloSign among 27 apps that will make you more productive when you use DropBox for Business.
“HelloSign lets you sign documents online. HelloSign integrates with Dropbox so you can sign any agreement from Dropbox, and save copies of your sent and received documents back to Dropbox for safekeeping."
To sync your HelloSign account with Dropbox, just click the Dropbox icon the next time you upload a document to be signed. Once you are synced, you can click on the Dropbox icon whenever you need to pull a file from your Dropbox account to request a signature or sign and send.