I’m trying to do the exact same thing, but using wordpress “custom” pages and php $_GET to read the image name passed through the URL.. it’s not working so far.
I want to do like xxx.com/?page_id=21&image=abcd.jpg
and in the custom page (page 21), do <img src=”https://www.xx.com/images/”<? echo $_GET[‘image’];?>>
not working though.. anyone have any other ideas?