Hi @imsodin !
Yep, just did it :
syncthi+ 1568 0.0 0.1 4648 928 pts/1 S+ 16:44 0:00 grep --color=auto syncthing
syncthi+ 6501 0.0 0.6 800708 3380 ? Sl 00:25 0:02 /usr/local/syncthing/bin/syncthing -home=/usr/local/syncthing/var
syncthi+ 6674 24.4 16.8 803012 85664 ? Sl 00:25 239:28 /usr/local/syncthing/bin/syncthing -home=/usr/local/syncthing/var
So it seems to be the user syncthing running the process, right ?
And for the permissions/ownerships :
root@MYNAS:/volume1/photo# ls -la /volume1/photo/FirstName
total 12
d---------+ 2 syncthing users 4096 Jan 6 16:37 .
drwxr-xr-x+ 4 PhotoStation PhotoStation 4096 Jan 6 16:36 ..
and
root@MYNAS:/volume1# ls -la /volume1/photo
total 20
drwxr-xr-x+ 4 PhotoStation PhotoStation 4096 Jan 6 16:36 .
drwxr-xr-x 21 root root 4096 Jan 6 00:24 ..
drwxrwxrwx 5 http http 4096 Jan 6 00:24 @eaDir
d---------+ 2 syncthing users 4096 Jan 6 16:37 FirstName
Does it help ?