Video URL You can enter the Video URL directly in this field or you can use the "pencil" icon after clicking the video elements "cog" icon to edit the Source and Video Id individually.
Source This is the video service support in the element. Currently, only the YouTube and Vimeo sites are supported in the drop-down selector.
Video Id (updated) This field can be used for the Video ID. You will only need to enter the video's specific ID and not its entire URL when using the Source drop-down selector. Optionally, you can leave the Source field blank and enter the full video URL into this field.