Empty url check # Go to user profile and click edit profile scroll down to Description use "Insert/edit an audio/video file" button In "Link" tab, leave source URL input field empty, and click submit, you should see a warning: "A media must have a URL.", start to type in source URL input field, then click away from it, the warning should go disappear In "Video" tab, leave source URL input field empty, and click submit, you should see a warning: "A media must have a URL.", start to type in source URL input field, then click away from it, the warning should go disappear In "Audio" tab, leave source URL input field empty, and click submit, you should see a warning: "A media must have a URL.", start to type in source URL input field, then click away from it, the warning should go disappear don't refresh the page yet, do the duplicate ids check below: make sure no duplicate HTML ids from atto editor Open browser's developer console and copy paste the code blow: function getAllDuplicateIds() { const elements = [...document.querySelectorAll('[id]')]; const ids = elements.map((el) => el.id); const dups = elements.filter((el) => ids.filter((id) => id === el.id).length > 1); return dups.map((el) => { return { id: el.id, el }; }); } var dups = getAllDuplicateIds(); if (dups.length > 0) { console.error('found duplicate ids'); console.table(dups); } else { console.info('📗: all good'); } Press "Enter", then you should be able to see this output: