Premiere pro Parallax opener templates

Hello there,
I have 2 quick questions,
-Regarding the many parallax openers templates for Premiere Pro available, is it possible to replace the images that come with the templates with our own images ?
-I keep having these error messages (Motion Graphics Template is corrupt) whenever I try to drag and drop the file on my clip. Does anyone know what could be the problem ?
Thank you,
Adlane