For a fresh Moodle 3.5 site: Set up Create a fresh site from integration master , using Boost theme. Log in as admin. Create a new course (c1). Testing Open the course and click Announcements . Click Add a new topic . In the Message section, CONFIRM the five media icons on the right of the message toolbar have icons in the following order, and with the following mouseover text: 1 - Image icon: "Insert or edit image". 2 - File-video icon: "Insert or edit an audio/video file". 3 - Microphone icon: "Record audio". 4 - Video icon: "Record video". 5 - Files icon: "Manage files". Also CONFIRM clicking each of the icons opens the expected tool (eg clicking the video icon open the record video tool). Navigate to [yoursite] /admin/settings.php?section=editorsettingsatto. Scroll down to Toolbar config and CONFIRM the line in the config, as well as the Default text below the textarea show the files row as follows: files = image, media, recordrtc, managefiles Update the site theme to Clean, and repeat steps 1-6. Clean does not support FontAwesome icons, so will display the equivalent SVG/PNG format icons (which should look the same, but be grey instead of black). For upgrading a site: Set up Create a fresh site from stable master . Log in as admin. Navigate to [yoursite] /admin/settings.php?section=editorsettingsatto. Scroll down to Toolbar config . If the files row is not as follows, update it to match: files = image, media, managefiles, recordrtc Click Save changes at the bottom of the page. Create a new course (c1). Open the course and click Announcements . Click Add a new topic . In the Message section, check the five media icons on the right of the message toolbar match the default stable master format: Testing   Upgrade the site using integration master . Follow the testing procedure steps 1-6 from "For a fresh Moodle 3.5 site" above. This ensures the upgrade process is updating media icons in the same way they will appear for a brand new site.