Remote access and updating

The Pi 4 is not supported on OSMC quite yet. If you have the upload bandwidth on your end to support streaming the movies without transcoding then you might consider going the Plex route instead of actually keeping two copies. Someone managed to get it going and wrote up a guide here. If you have to transcode I don’t know that the Pi would be fast enough to do that (it might, I doubt it, but I have never tried).