Elden Ring PC | Unlocking Rampart Tower elevator in Stormveil Castle, from same name site of grace

Starting from the Rampart Tower site of grace, unlocking this elevator, then back to the same site of grace.

There's more than one elevator in the Rampart Tower. The other one (not yet unlocked) is shown at 2:55.

Stormveil Castle
"Stormveil Castle is a Legacy Dungeon in Elden Ring. A castle that lies on the cliffs of Stormhill, a stronghold of Godrick the Grafted. Be wary of this location since there are hordes of soldiers and hostile creatures that will stop anything and anyone who tries to infiltrate the area. Players entering Stormveil Castle should beware that it's a challenging dungeon with groups of numerous enemies with traps and ballistas as well as mini-bosses. This area does not allow riding."
https://eldenring.wiki.fextralife.com/Stormveil+Castle