My set up is five ATV3, Time Capsule and Three Airport Extremes. I have come across an issue where Photos not longer updates automatically when you add new photos to the library (as it did with Aperture). The simple work around with this was to turn home sharing off, quit iTunes, go back into iTunes and enable Home Sharing again. This stopped working after I installed El Capitain, in fact I was unable to access Photos at all once I'd quit home sharing. If anyone else is having this issue, the work around I found was before turning off Home Sharing, untick Photos from photo's to share and click on apply. Then turn off home sharing and quit iTunes. Go back in restart home sharing and tick the Photos box again and hey presto your photos should update and all is well in the world. Would be ideal if somewhere down the line Photos could update automatically on the ATV as it did with Aperture. I would be interested to know if anyone else has had this issue.