are u familiar with cli linux ? then do below
u need physicall attach your HDD using SATA or USB / reboot possibly
ssh-> into ur box start9/umbrel/embassy whatever
lsblk (to find the preformatted device /dev/sdd)
sudo mkdir /hdd20
mount /dev/sdd /hdd20
filebrowser -r /hdd20 -a lanip -p 555
if u have used windows means ntfs formatted
below adv user u wanna **old cheap** disks for data which can **lose** disk fails
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