I have tried to upload mp4 format videos in a online-built ckeditor5 by trying to modify the editor configuration like this:
ClassicEditor.Editor
.create( document.querySelector( '#editor' ),
{
image: {
imageUploadConfig: {
types: [ 'png', 'jpeg', 'jpg', 'mp4' ]
}, ...
but it doesn't work. The mp4 files do not appear in the supported types when browsing and choosing them from all types does not have any effect. What am I doing wrong and is there another way to do this?