Board Thread:Support Requests - Getting Technical/@comment-36036040-20200531003004/@comment-9605025-20200531052512

Within the editor, adding images and adding videos have been moved to the same button. The action is now referred to as adding media. I believe you should be able to upload video files from your local computer using either the in-editor upload process or Special:Upload. As for adding videos from sites like YouTube, you must do so using the add video button on Special:NewFiles (which Special:Videos redirects to).