I've been a long-time Plex user, but it's been largely polished and not in need of documentation. However their new DVR solution has some quirks in that it's the first time I need to write to a directory.
One option is to create a dedicated DVR directory. For example, I use /mnt/movies and /mnt/tv_shows. A trivial solution is to create /mnt/dvr/movies and /mnt/dvr/tv_shows with different permissions owned wholly by Plex. But I kind of like the idea of a merged library allowing me to pull DVR shows in the same searches and browses as non-DVR shows.
Group permissions are the key to this solution. I want to be able to write to a directory, but I also need Plex to be able to write to it. As such, I created a media group and added both myself and the plex user to it.
sudo groupadd media sudo usermod -a -G media plex sudo usermod -a -G media $USER
Then I need to create a directory and ensure that new files are owned by the group:
sudo mkdir --mode=u+rwx,g+rwxs,o+r,o-wx /mnt/movies sudo chown plex:media /mnt/movies
Now you can touch test.txt in this directory and verify that it's owned by the media group. If you sudo su plex you should also be able to create a test.txt file.
Samba creates a few other issues. First we'll want to ensure that the directory is writable in the /etc/samba/smb.conf configuration:
[movies] comment = Movies path = /path/to/movies guest ok = no writable = yes browseable = yes valid users = your_username, plex force group = media
In the Plex server's /etc/fstab you should have a line like the following:
//samba-server/movies /mnt/movies cifs credentials=/etc/smbuser/plex,_netdev,noauto,defaults,noperm 0 0
The /etc/smbuser/plex file is very simple:
If course, you'll want to sudo chmod 600 /etc/smbuser/plex and not use a very important password here.