The term "SS 19 Blue String MP4" seems to refer to a specific type of video content associated with SS Maisie. The "SS 19" likely denotes a particular series or collection, while "Blue String" could be a distinctive element or theme within that content. The "MP4" extension simply indicates that the file is in a video format.
If you obtain the MP4, use or ffprobe to extract creation date, software used, and possibly GPS or author tags. That can reveal original source. ss maisie ss 19 blue string mp4