Paralex Background Help!

I need help with Parallex backgrounds. I placed some items on a Parallex background, like a side quest where you have to scale a monster to get treasure. How do I make the paralex background move with the player?

The size of the parallax picture needs to fit to the map, that means parallax size in pixels has to be (map size in tiles multiplied with tilesize in pixel). In case of MV that tilesize is 48*48 pixels.

After that is correct, you need to make sure that the filename for the parallax begins with !