Split shipments cannot use the Branded Returns feature in ShipStation.

[admin81]

About 30% of our orders are split and shipped from different warehouses. 

But Branded Return Portal does not allow customers to put their "order #" and "zip code" and self-service create a return label.

This is a big drawback and makes shipstation return portal not very helpful to us.

I would suggest allowing split shipments to use Branded Returns.