1. In Microsoft Forms, open the form you want to edit.

  2. Select the question you want to add a video.

  3. Click Insert Media Insert image on the right side of the question.

  4. The Insert media pane appears on the right side of the form. Click Video on this pane.

  5. You can only add videos hosted on YouTube to form and quiz questions. Enter the URL for the YouTube video you want to use and then click Add.

    Insert YouTube video box for Microsoft Forms

    Note: You'll see an error message if you try to use a video that isn't hosted on YouTube.

  6. When you preview your form or quiz or view your form in design mode, you'll see the video beneath the question.

Source: Microsoft