Editing drive in movie in Tucson

Hi,
I want to put a different image in one of the drive in movie screens in tucson photo real, the image i want to replace looks like this.....

I tried replacing it with an image with one the same name and size etc.. but it doesn't work .
Do i need to create the image with certain software or is there more to this than i think?
Any advice would be appreciated
I want to put a different image in one of the drive in movie screens in tucson photo real, the image i want to replace looks like this.....

I tried replacing it with an image with one the same name and size etc.. but it doesn't work .
Do i need to create the image with certain software or is there more to this than i think?

Any advice would be appreciated