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# How can I troubleshoot inventory sync issues with my SKU files?

If your inventory is not syncing correctly, start by checking a few common causes:

* If multiple variants share the same SKU, Stock Sync will update all of them with the same quantity. Make sure your feed provides per‑variant quantities if you need different values.
* If your feed contains blank quantity fields, add a Quantity rule such as: If Empty → 0, so updates are applied correctly.
* Check your Store Product Filter. Filters like “Only include variants with Track Quantity” can block products from updating.
* Ensure your SKU mapping matches exactly between your file and your store. Incorrect SKU formatting or using multiple fields to build a SKU can cause mismatches.
* Run a Preview Sync to see what quantity will be applied before running the full update.

These steps usually identify why a SKU is not updating or why quantities appear incorrect.