I would like to receive motion event from Synology Surveillance Station with snapshots to make HA sends notification with snapshots and react on movement events by automatization settings.
Is there a way to do this?
Yes. There is already at least one thread on this in the community. Try searching for Synology motion.
In short - create webhook automation in HA that would be triggered by synology webhook call. It can than take snapshot of camera (from within HA) and use that snapshot image in your notification.
On synology create in action rule, event that gets triggered by motion and in action, cal webhook url you’ve created with POST.