Bernie scanned all his slides and has them stored on his NAS, as well has having burned them onto Blu-ray discs. Is there a way to play ISOs on his 4K TV? Bernie will probably need a media server running Kodi.
The chatroom says that Synology Disc Station manager has the ability to mount virtual drives in File Station. Then he can use DSPhoto to play it back. VLC works with it as well. Windows 10 can also cast to the XBox One. There's plenty of ways to do it.