Delete images for multisite

I am trying to add this to a multisite installation
It isn’t working when run from each site
My understanding is that the first site you create is site ID #1
which stores images in the uploads/year/month

ANY subsequent sites created stores the images under /uploads/sites/siteid/year/month.
Can you offer a mod that will include the site ID as the path changes so it provides the correct path to the images?

I tried adding it to the theme fuctions in the admin theme editor but it won’t let me save.

I also was unable to find a functions.php under any site folder

The page I need help with: [log in to see the link]