browse phone filesystem with kdeconnect

[yahoo-pier_andreit]

on my laptop with kdeconnect
kdeconnect-kde - KDE Android integration 0.8-2.1
on  my samsung S4 mini using kdeconnect version 0.8:

when I click on the folder to browse the phone filesystem this advice 
appear:
"There is no application installed that can open files of the type empty 
document (application/x-zerosize).
Do you want to try to install one?"

I answer not
and in dolphin is opened a tab with this address:
/var/tmp/kdecache-pla/krun/4489_0_/
but it is empty

in the dolphin places side panel I can see my phone's icon and if I 
click on it this tab is opened:
kdeconnect://f8e59d5b1b311703/

with inside this tree:
file:///home/user/.kde4/share/apps/kdeconnect/f8e59d5b1b311703/storage/extSdCard
file:///home/user/.kde4/share/apps/kdeconnect/f8e59d5b1b311703/storage/extSdCard/DCIM/Camera
file:///home/user/.kde4/share/apps/kdeconnect/f8e59d5b1b311703/storage/emulated/0
file:///home/user/.kde4/share/apps/kdeconnect/f8e59d5b1b311703/storage/emulated/0/DCIM/Camera

where:
/home/pla/.kde4/share/apps/kdeconnect/f8e59d5b1b311703/storage/extSdCard/
is empty
/home/pla/.kde4/share/apps/kdeconnect/f8e59d5b1b311703/storage/extSdCard/DCIM/Camera/
contains my SDcard photos :-) verygood!!
/home/pla/.kde4/share/apps/kdeconnect/f8e59d5b1b311703/storage/emulated/0/
a lot of things that seems also my SDcard contents
/home/pla/.kde4/share/apps/kdeconnect/f8e59d5b1b311703/storage/emulated/0/DCIM/Camera/
is empty

on my sony xperia z1 compact using kdeconnect version 0.8
appear this:
faliled to mount flilesystem: device not responding
if I click in the phone's icon in dolphin places sidepanel this tab is 
opened
kdeconnect://8bf11bf744689304/
but this error appear:
Could not mount device.
The reported error was:
Could not mount device filesystem
and I cannot go ahead....

for samsung it seems better than the previous situation but can be 
better :-) for the sony it is worst :-(
...manythanks, ciao, pier