@kiendeleo The main DSF services including user-space plugins run as dsf user. If the Motion webcam plugin is installed via DWC, it should already have access to external storage devices provided a recent DuetPi image with auto-mount support is used. It is probably necessary to add the fileSystemAccess permission to the plugin manifest, though (it's sbcPermissions in plugin.json or once installed /opt/dsf/plugins/MotionWebcamServer.json AFAIR). If you change the latter file, reboot the SBC when done.