like install a ubuntu server with no gui and then install into this plex?This is LXC container. I recommend to create classic VM and use USB passthrough with USB attached disk. It is much more simpler.
I added USB but plex not see the source. I have to mount this?Correct and add USB device
ok I solved! I inserted usb disk like your picture then is necessary enter into ssh shell of vm in this case ubuntu server and than I created a folder to mount for my disk, in this case /dev/sda1 and is done! Plex sees the disk. Thanks for your help!Add passthrough USB device (disk)
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In console of VM you should see the new disk as block device (as normally attached disk). In my example Samsung 64 GB, as sdb.
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I do not know how works plex media, If access to device directly, or you need to mount, but this is out of scope Proxmox coverage.
L.