I tried PhotoSync, but it feels like a really misleading name. When I delete photos from my phone, they don't delete on the sync destination, so it's not actually a "sync".
So my photo storage on my home server is getting filled with a bunch of useless images that I only have on my phone temporarily and that I end up deleting shortly after.
ACK. The best part is the one-time-pay option to unlock background sync with many different triggers which can be combined - mine 03:00 am with charger connected in my WLAN. Love the software.
I think you can use Immich to just look at a folder and not use the backup from phone bits.