Mobile and Tablet OS browser versions aren't supported for Blackboard Learn. You should not be using the web-browser on your device to access Blackboard Learn. Mobile device browsers are not full-fledged browsers and are missing many of the vital components necessary for Blackboard use. Instead use your desktop / laptop. Mozilla Firefox has consistently proven to be the most reliable. Both Safari and Google Chrome lack specific features that make assignment submission and/or test taking unreliable or, in some cases, impossible.