AppleTV Screensaver - Home Sharing Unlimited Photos

I've used the MAC Screensaver function to display photos from my hard drive on my Mac for a while now. I'm trying to do the same with my AppleTVs using the home sharing option but appear to have hit a snag.

I created a Screensaver album in MAC Photos and directed the AppleTV to it using the home sharing feature in General/Screensaver. However, the screensaver only seems to display about 100 photos rather than the 100s in the album. Is there a way to fix this..? Ideally, I could display all the photos in the album and update as and when more photos are added.

Any advice, would be gratefully received.

Thanks!