"Old Fortress Cleanup" at Honkai Star Rail

So, as part of this quest, you will need to find special clues in the Corridor of the Disappearing Echoes. Click on the bird, which will indicate the location of the hint. You need to put the bird as close to the gate as possible.

Having found the quest item, we go to the next marker on the map. True, now the bird will not point us to a clue, we need to find it on our own.

In the third place, you can already put the bird again in this place:

Then unlock the rotating bridge using the controller by performing a certain sequence of actions on it: first turn clockwise, then counterclockwise, and then turn clockwise again. Turn the mechanism so that it allows you to pass to the other side, where Pela is waiting for you.

At the very end, you will have to defeat the enemy, after which the questt will be passed.