Login as an administrator Create a test course Create a test quiz inside the test course Add 1 MCQ question Populate the question text and upload an image Populate the choice answer 1 and upload an image Populate the choice answer 2 and upload an image Populate the choice answer 3 and upload a text file Save changes Go to Site administration > Define roles > Non-editing teacher Allow question:viewall for Non-editing teacher Create a test user Enrol the test user into your test course as a non-editing teacher Login as the test user Go to the test course and click on question bank Find the MCQ question Click on Actions drop down menu and select View. There will be an error: Exception - MoodleQuickForm_editor::get_text(): Return value must be of type string, null returned (This error has been raised in MDL-79026 ) As a workaround, modify line 257 of the lib/form/editor.php from: return $this->_values ['text'] ; to: return $this->_values ['text'] ?? ''; Refresh the page and verify that the error is gone and the images are not displaying Click on the text file link and verify that it will show a broken file url (e.g., http://localhost:8000/brokenfile.php#/17/user/draft/811506973/helloworld.txt) Undo your code changes in lib/form/editor.php Apply the MDL-29421 -master-latest.patch Refresh the page and verify that the images are appearing and the text file can be viewed