I use Nextcloud Memories and auto-upload from my phone's photo folders. I love it. I don't mind the lack of a dedicated app.
I’m using photoprism. It closest to Synology photos. I use nextcloud to automatically upload the pictures but photoprism to view and share them.
I like Photostructure as a way to browse my photos. It does logical deduping, and automatic organization of your photos (if you want it to). Like some others mentioned in this thread, it's a very young software, but the developer is very active and transparent about the progress.
Edit to add link: photostructure.com
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