Facbook Ads, create new ad in ads set

Hi all

I want to set new ad on Facebook usign existing post in campaign and ads set which i have created before. When I try do this by Facebook Ads Campaign → Update an ad → Ad creative → Create new Ad creative, →

JSON field:
“name”: “My Ad Creative”,
“object_story_id”: “existing post id”

it’s dont work.

Do i need make any step before, to create new ad and get ad ID to update this with post content?