How to set the automatic download version of Local AC in a hierarchical AC networking scenario

How to set the automatic download version of Local AC in a hierarchical AC networking scenario?

Take WX3510H as the local ac as an example, the local ac is similar to the role of ordinary ap at this time. 

In addition to the basic configuration of hierarchical networking, the ipe file of local ac needs to be uploaded to the apimge folder of central ac, and the original WX3510H ipe version name is renamed to "wx3510h.ipe" standard format.