OK, so I finally fixed my issues with the DVR!
The issue was that the share was being mounted as root:root. I found out how to change this in my fstab entry so that the mount would be for plex:plex.
//freenas/media /shares/media cifs comment=systemd.automount,credentials=/home/castacio/.smbcredentials,iocharset=utf8,defaults 0 0
//freenas/media/DVR /shares/DVR cifs uid=plex,gid=plex,comment=systemd.automount,credentials=/home/castacio/.smbcredentials,iocharset=utf8,defaults 0 0
Notice the difference between the DVR share mount and the media share mount is uid=plex,gid=plex. This will give PMS the write permissions, as the plex user, necessary to save to my NAS.
