I assume you're talking about the built-in Synology Photos app? I have a Synology NAS and keep putting off the decision for how I'm going to handle photo hosting. Ideally I'd want:

• a unified archive (old stuff on random hard drives from both me and my wife, plus exporting/linking each of our icloud photo libraries and google photo libraries)
• some kind of structured browsing, organizing things by timestamp (and including that in the filename) is fine
• some kind of facial recognition, ideally a semi-manual approach that does its best on its own and then prompts for or accepts manual corrections
• optionally, some kind of semi-manual de-duplication for near-identical images
• optionally, an integrated way to share content, e.g. so I can text a friend a link to a specific album behind some kind of user authentication system