How to make a specific user as a Creator

I am copying some records from app A to app B using backend workflows in app B exposed as API. I am making calls from app A and everything is working as expected except the Creator field. By default it is being assigned App Admin despite me passing the X-Bubble-App-User-Id key which is the Unique ID of the existing user in app B as per my requirement . Does anyone knows any workaround this?

You can’t change that field. Instead use another field like UserCreator type User and reference that to the old user creator. This field you can modify because you created it.

Okay. Thanks.