Available in Q3: Cloud storage integration

Blackboard Learn 9.1 Q2 2018 

Instructors can copy files from their favorite cloud storage solutions when authoring Content Items or creating Assignments. Students can submit assignments from their favorite cloud storage solutions. Cloud storage that is supported includes OneDrive, OneDrive for Business, Google Drive including G suite accounts, Dropbox, and Box. 

More on how instructors add content from cloud storage

Cloud Services integration isn't compatible with the generally available version of 9.1 Q2 2018 (build 3400.0) or SaaS Q2 2018 Flexible Deployment Option release. A Cumulative Update will be required to enable the feature. This feature is available in Learn SaaS Continuous Delivery environments.