Problem mounting SSD

Sorr for the delay, so far now i have followed This tutorial to try to solve my problem, but got stuck on the last step since after the

sudo chown $USER:$USER <path-to-mountpoint>

command the ssd has disappeared from the file manager and has become unable to use, this is how -f looks like

NAME FSTYPE FSVER LABEL     UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
nvme0n1
│                                                                               
├─nvme0n1p1
│    vfat   FAT32           4BBE-DD14                             299.1M     0% /boot/efi
└─nvme0n1p2
     ext4   1.0             91cd6650-d370-4cc8-8e98-e912427a7761    377G    14% /
nvme1n1
│                                                                               
└─nvme1n1p1
     ext4   1.0   GArchives d0fcf860-e39b-48be-96fe-0abbaeb22f35  869.2G     0% /srv/GArchives

something i have to say is that the ssd has a 1tb capacity so i don`t know why it shows 869.2G, even on GParted it showed the 1tb