Why a new Etsy listing can arrive without a section
A new Etsy listing arrives without a section when the section Shuttle sent no longer exists in your Etsy shop. This usually means the section was deleted in Etsy after you set it up in Shuttle.
Etsy refuses a listing that points to a missing section. So that the whole transfer does not fail, Shuttle sends the listing again without a section, and the product still reaches Etsy.
Shuttle does not show a warning when this happens. Usually the first sign is a new listing that is not in any section.
Where Shuttle gets the section for a new Etsy listing
Shuttle checks these in order and uses the first one that gives a section:
The section you chose under Assign to a section when you transferred a single product.
The section name in the Shopify metafield whose key you entered under Section from Shopify metafield.
Your Collections → Sections mapping, if Assign sections based on Shopify collections is turned on.
You'll find Section from Shopify metafield and Assign sections based on Shopify collections in Settings > Products > Shopify → Etsy, under Etsy Section.
Check that the section still exists in Etsy
The section has to exist in your Etsy shop before Shuttle can assign products to it.
In Etsy, check your shop's sections and confirm the section you expect is there.
If it was deleted, create it again or decide which section to use instead.
In Shuttle, go to Settings > Catalog Mapping > Collections → Sections and click Refresh. This updates Shuttle's list of your Etsy sections.
Check your Collections → Sections mapping
When Etsy refuses a section, Shuttle removes every Collections → Sections row that pointed to it. As a result, a collection that used to have a section may now have no row at all.
Go to Settings > Catalog Mapping > Collections → Sections.
Look for the collection the product belongs to. If its row is missing, click Add row, choose the Etsy section, then click Select collection and pick the Shopify collection.
Click Save.
Go to Settings > Products > Shopify → Etsy and make sure Assign sections based on Shopify collections is turned on under Etsy Section.
If a product is in more than one mapped collection, the highest row in Collections → Sections decides its section.
Check the section metafield, if you use one
If you entered a metafield key under Section from Shopify metafield, Shuttle reads the section name from that metafield on the Shopify product. This takes priority over collection mapping. The name must match a section in your Etsy shop, though capital letters don't matter.
If you renamed or deleted the section in Etsy, update the product's metafield to the current section name. If the name doesn't match any section, Shuttle falls back to your Collections → Sections mapping.
Put the listing that is already on Etsy into a section
The listing that arrived without a section stays that way until you change it. Fixing your settings only affects transfers from then on.
You can fix the listing in either of these ways:
In Etsy, open the listing and choose its section.
In Shuttle, turn on Allow section changes on product updates under Etsy Section in Settings > Products > Shopify → Etsy. Then update the product from Shopify to Etsy with Sections selected, and Shuttle sets the section from your settings.