The Server does not automount USB disks. Only the Desktop version does.
To mount, do as root something like:
mkdir /mnt/usb
mount /dev/sdb1 /mnt/usb
This assumes that /dev/sdb1 is your 1st partition on USB drive. If in doubt run parted or fdisk /dev/sdb to determine USB drive.
and you can access your files.
If you want to automount every time, add this to the end of /etc/fstab as root:
/dev/sdb1 /mnt/usb vfat defaults,umask=0222,utf8=true 0 0
change the defaults,umask=0222,utf8=true to defaults,users,uid=<username>,gid=users,umask=022,utf8=true
if you wish a user to own it. (utf8=true is optional and maybe best if you copied linux files to it with a linux machine)
make sure to
chown user:usergroup /mnt/usb
chmod 755 /mnr/usb
before you mount it if you want to do this.
Extra info:
https://www.linuxquestions.org/quest...-flash-449377/
Cheers!