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Troubleshooting browser problems
Many problems with missing form fields, buttons that do not function, or other page display issues are caused by your browser. Here are some things to try to fix viewing problems:
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edX app support
The edX app is free and available for smartphones and tablets on both Android and iOS platforms.
While smartphones and tablets can be used to access and take courses, some more advanced problem types and content features may not function properly.
Note: If your course includes timed exams or proctored exams, you cannot take them using the edX app.