This issue should be tested both in iOS and Android devices. Log into a site and download a couple of courses for offline use. Once they've been downloaded, there should be a new option to remove the course from the device. This can be found in the options menu in the course card in the dashboard. Delete a course using this option, and make sure that the course has been removed. This can be checked by restarting the app and making sure that the download option is available again. Make sure that all the course files were removed as well. To do that, open a course and go into the "Manage storage" page (options -> Manage storage). Go back to the dashboard, and open the screen "Manage storage" from the dashboard options. You should see a new page to manage the storage with all courses. Remove one course and make sure that it works the same way as removing it using the option in the course card. Now use the button to remove all the courses and make sure that it works as expected. Start downloading a new course, and before the download has been completed open the Manage storage page from the dashboard. The course being downloaded should be displayed as such and the remove button should be disabled. Wait until the download is completed and check that the button works as expected. Finally, download a couple of courses and while some downloads are still in progress open the screen again. Use the button to remove all the courses, and make sure that the course/s that were downloading weren't removed and their downloads complete successfully.