I have a synology nas and I use the synology photos app for auto uploading without loss of quality to my nas. Don't forget any picture or videos, deduplicate, figure out what you can safely delete from my phone,... All of that works great and is reliable.
The synology photos app to watch your photos though, isn't very good. Neither on mobile nor the desktop nor android TV. It's bare minimum and even that has failures.
Next cloud,... It gives a weird "I don't trust it" vibe. I want my stuff unedited unaltered, unmoved from their folder and keep your metadata elsewhere, and it just give me a wrong vibe for that. This is 100% feeling and not facts.
Immich is great but high maintenance, any update is a risk that you have way more work that planned. Their upload app need works but I use the synology one. I don't feel safe having that handle the main copies of my picture, and the dev are being super clear that I shouldn't.
Photoprism has been my go to. You need to pay for any advanced features, and unless you're solo you need them for permissions only. I love it but I feel like it's still not quite as good as I would like.
Is there any major, reliable app for that I missed?