Shopify's product CSV import silently discards variant metafields. Tested on a live store with all three documented header spellings: none of them wrote a value, and every import reported success. Fieldloader exports one metafield to CSV — a row for every variant, including the empty ones you are there to fill in. Edit it, send it back, and see the diff before anything is written: what is new, changed or cleared, and every bad row against its line number. One click puts a whole import back.
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