访问谷歌云存储上的私人数据

I am using Google Cloud to set up a map server. The goal is to serve private images that are broken into tiles and stored into subdirectories of the format z/x/y where z is the zoom level, x is the horizontal axis and y is the vertical axis. I want to be able to access those tiles through LabelBox (I am using Google Cloud to set up a map server.