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"Category mapping not found" is the error most sellers meet first, and it comes from a setting rather than a fault. The marketplace category for that product has not been set, or the mapping points at a category the marketplace no longer offers.
The video shows where the mapping lives, how to assign the right marketplace category, and how to re-run the export. Fixing it at the mapping level rather than per product means the whole product group stops failing at once.
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Per-product overrides: send Amazon a different price or a capped quantity without touching what your store shows.
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Where metafields are defined and filled in Shopify, so that marketplace-only product data has somewhere structured to live.
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The other half: mapping a store metafield onto the Amazon attribute that needs it, so required data is supplied automatically at export.
Start a free trial and set your mapping, pricing and attribute rules once, then let every product follow them.
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