What does Death Video 3 have to do with the first two movies?

If the landlord has seen the death video 1, he should remember that a dog named MAX was infected with the virus in the third film and then bit the hero's uncle. . .

The landlord read the following official text:

Behind the scenes production

As the third episode of the "Death Video" series, the latest film "Death Video 3: Origin" is bold and innovative, which not only continues mockumentary's shooting technique, but also moves the bloody cannibalism scene to the daytime in order to create a more realistic horror atmosphere. The story of this movie is set very close to the shooting location of the first two movies, which will explain some puzzles left in the first two movies and also lay the groundwork for the next sequel, Death Video 4: Revelation.