Photos is a really great feature and it will be greater if in the SlideShow Settings, right below the image thumbnail, the filename is presented.

With this feature it will be easier to recognize the image and less mistakes will be done.

I have clients that shows hundreds of images in their lives and right now I keep a windows explorer window side by side with SlideShow Settings to select the correct image based on the filename.

If there is any other better/correct way to do this, please let me know.

Thanks in advance!