I've had Synology for years and I have used their Photos and Momemts app.

It's pretty dang hard to recreate a Google service.It's great for backup and have control over the photos - but dang it's slow....if I need something real quick, I usually go to google photos...even when I'm home. Maybe I need to upgrade to a NAS w/ faster processor, I don't know.

I've turned off the Google Photos facial recognition stuff because of privacy, but dang I miss the convenience. Moments has their own but it's not a good.

Google photos I can easily search for a city or text or an object and it pops up quickly.