how to Download Directly on the Server via Command Line
sudo journalctl -u terraria -f
sudo add-apt-repository multiverse -y
sudo dpkg --add-architecture i386
sudo apt update
sudo apt install -y steamcmd
steamcmd +login anonymous +workshop_download_item 1281930 2824688072 +quit
/root/.steam/steam/steamapps/workshop/content/1281930/2824688072/
cp /root/.steam/steam/steamapps/workshop/content/1281930/2824688072/*.tmod /home/terraria/.local/share/Terraria/tModLoader/Mods/
sudo chown -R terraria:terraria /home/terraria/.local/share/Terraria/tModLoader/Mods/

Enable the mod (required — copying the .tmod file alone does NOT activate it):
cat /home/terraria/.local/share/Terraria/tModLoader/Mods/enabled.json
  - if this shows [], the mod is present but inactive and will not appear in-game, with no error logged
cat <<'EOF' > /home/terraria/.local/share/Terraria/tModLoader/Mods/enabled.json
["ModNameHere"]
EOF
  - use the mod's internal name (the .tmod filename minus the extension)
  - multiple mods: ["ModOne", "ModTwo"]

sudo chown -R terraria:terraria /home/terraria/.local/share/Terraria/tModLoader/Mods/
sudo systemctl restart terraria
sudo journalctl -u terraria -f
  - confirm the mod name appears in a load line just before "Server started"