The Spanish Flu - The Great Killer
La Grippe espagnole, la grande tueuse (original)
Starring Éric Caravaca, David Lloyd George, Charlie Chaplin, Matthias Klie
It's a documentary movie, and has a rating of 7.3 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Argentina.