Do not use a mobile device* to submit content in your eLearning course(s), including tests, assignments, and discussion board submissions.
If you must rely on using your mobile device to participate in your online course, you may be interested in downloading Blackboard's Student app. It is available for both iOS and Android.
The app is free to download and use; however, the Blackboard app also has limitations on the features that are supported.
As such, eLearning Support recommends that students use the Blackboard app to consume content (read announcements and discussion posts, check due dates, etc.), and to use a full-fledged browser on a computer to submit content that may be graded.
*A mobile device is any device that uses apps instead of full software. Some common mobile devices are iPhones, Android phones, iPads & tablets, eBook readers, and ChromeBooks.