Mainly import the some questions from https://tracker.moodle.org/secure/attachment/32973/questions-T-26511_with_or_no_images-20130604-2349.xml which put specific images in the question text, answers for multi and feedback for all question types and the same questions without images. Check the behaviour of set_subquestions_elements_itemid($question, '@@PLUGINFILE@@'); and looking at the file table records that the setting of image links are only created if there is an image in the given element. This also verify that the import is OK. Then edit copy the questions. test the decode verify display, save the question. This will test the filtering process set_subquestions_elements_itemid($question, 'draftfile.php'); Create a copy of the question to another category. Move the questions to another category and context. Create a quiz, test OK.