For me it was line 100…but yours will vary depending on which template you are using.
When you find that, you want to replace it with
{% assign lineitems = line_items_in_shipment | sort: “sku” %}
{% for line_item in lineitems %}
Once you make the change, be sure to save it. If you still don’t see the change working, perhaps trying logging out and back in again to see if that resets it and allows the change to take place.
I already have this set up but we use skus like S12, A47, etc so it will sort S2 after S12, because 2 comes after 1. Is there a way I can get it to recognize 12 as a higher number than 2?