Hi there,
Have you tried the XFCE file browser (i.e. Thunar , cf. xfce:thunar:start [Xfce Docs] ), available from the Applications menu or the bottom bar once connected to XFCE via X2go?
NB , while preparing login2 in CentOS 7, we were obliged by external factors to replace GNOME with XFCE (cf. WIP: Migrate Baobab to CentOS7 - #3 by Luca.Capello ). Nevertheless, Thunar is mostly at the same level as Nautilus in term of features.
Thx, bye,
Luca