Test in a thunderstorm (The Legend of Zelda: Breath of the Wild)

And what exactly? At least a screenshot and a more detailed description.
I would venture to suggest that if this sanctuary at the waterfall, you will need to bring a metal object on the roof of the sanctuary (on the roof of the stone where it is hidden). Lightning strikes the object and the sanctuary will open.

Testing in the storm the way it is.There's still the trees are like huge mushrooms-glowing orbs need to put somewhere

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Throw something iron to the top and there'll be struck by lightning, the rock to collapse the entrance to the sanctuary will be open.

if it's about sanctuary parrot which sings in the water there is an iron box, put it on the sanctuary mountain and the storm + box= sanctuary