As admin, enable WebServices and "Mobile services": Server ► Web services ► Overview Server ► Web Services ► Mobile Create a course without a summary image in it Create another course with a summary image in it Create a user and enroll the user as a student in the course Create a Token for the student user: Click on Site administration ► Server ► Web services ► Manage tokens Next, you should do some CURL REST calling simulating a WS client with the student user. You need to replace the wstoken, coursename is the name of the course without summary image, and the URL of your moodle instance curl 'MOODLE_URL/webservice/rest/server.php?moodlewsrestformat=json' --data 'wsfunction=core_course_search_courses&wstoken=$wstoken&criterianame=search&criteriavalue=$coursename' --compressed Confirm that: You receive the course object in the response You have a param for courseimage that point to a URL similar to this:  $MOODLE_URL/pluginfile.php/$contextid/course/generated/course.svg Make the same request but now change the course to the course with a summary image Confirm that: You receive the course object in the response You have a param for courseimage that point to a URL similar to this:  $MOODLE_URL/pluginfile.php/$contextid/course/overviewfiles/$imagename Another CURL REST calling simulating a WS client with the student user. You need to replace the wstoken, and the URL of your moodle instance curl 'MOODLE_URL/webservice/rest/server.php?moodlewsrestformat=json' --data 'wsfunction=core_course_get_courses_by_field&wstoken=$wstoken' --compressed Confirm if both courses have courseimage following the same pattern inside the response Another CURL REST calling simulating a WS client with the student user. You need to replace the wstoken, studentid, and the URL of your moodle instance curl 'MOODLE_URL/webservice/rest/server.php?moodlewsrestformat=json' --data 'wsfunction=core_enrol_get_users_courses&wstoken=$wstoken&userid=$studentid' --compressed Confirm if both courses have courseimage following the same pattern inside the response Access and download the courseimages URLs in your browser Check if you can access and see the image Access your server logs and check if there are no warnings related to accessing images