

Multiple home users, hardware transcoding, media downloads on mobile…
https://support.plex.tv/articles/202526943-plex-free-vs-paid/
I use Plex BTW , but lurking Jellyfin for some time, just not so easy to setup or comparability for my shared users.
sudo mkdir /media/NewSSD # the name you like lsblk -f # look for UUID of new ssd
then add it to fstab https://wiki.archlinux.org/title/Fstab
Something like
UUID=<insert drive UUID> /media/NewSSD ext4 defaults 0 2
Make sure you use the correct filesystem (e.g. ext4 or other)