path on mtp device

[jenk]

Hi,

I'm struggling to find the correct path description for folders on mtp-devices to enter in one of the FFS addressbars for syncing files between my android devices and my desktop-pc:

I tried entering (as copied from dolphin address bar) in one of the FFS relative path-bars :
mtp:/ALE-L21/SD-kaart/jod/Other files/Tracks/
but this creates a new folder in my desktop-pc home directory, starting from where I installed FFS.

Connection is fine : as soon as I connect the android devices they show up in KDE and I can open them with dolphin and copy files from and to them.

I read on the web that the correct mtp-path should be found in /var/run/user/myuid/gvfs or /run/user/myuid/gvfs but these directories are empty.

As you notice probably from above : I'm on linux debian (buster) with plasma kde.
Any help appreciated !
TIA
JenK