Our software is designed to be able to update Amazon with any update a user does from their end on an FBA shipment that was created on Inventory Ahead. The other way around, updates that are done on Amazon on an FBA shipment that was created on Inventory Ahead, are brought in unintentionally to Inventory Ahead together with other information coming from Amazon. We do not have a separate method to import these updates into our system.
The best way to update a shipment would be to do the changes on IA and not on Amazon. If for whatever reason you are updating a shipment on Amazon, and the updates are not being imported, the solution would be to manually do all these changes to the shipment on Inventory Ahead.