The lack of dynamic refresh of remote smb shares in debian seems to be a long time Xfce issue, as per the few (mostly old) various forum's threads.
I guess a way of manually refresh in the various Guis would be the most straight forward fix.
That, or any type of dynamic local copying mechanism (rsync, syncthing, hosting the share on the machine rather than the server, etc.)
The syncthing option works great for me, been using the last days. It does exactly what I need, files appear in the gui's file browser as soon uploaded on the server, no user input needed.
