/usr/share/gvfs/remote-volume-monitors/gphoto2.monitor is in gvfs-backends 1.22.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [RemoteVolumeMonitor]
Name=GProxyVolumeMonitorGPhoto2
DBusName=org.gtk.Private.GPhoto2VolumeMonitor
IsNative=false
|