Morgan Stanley is offering its 3.2 million wealth management customers an encrypted platform where they can store financial documents and share them with the bank more securely than faxing, emailing or mailing information.

The Digital Vault, rolled out this summer, employs technology from Box, an online content-management and file-sharing service for businesses. The tool reflects financial institutions’ confidence in shifting confidential records from their own servers to third-party systems accessed online, or in the cloud.