An image will fail to upload if the file name cannot be associated with an ASIN or variant.
Some of the reasons we may reject an image are:
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The system did not recognise the ASIN (10-digit Amazon product identifier) or variant.
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The EAN/UPC/10 or 13-digit ISBN/JAN/GTIN does not belong to an ASIN.
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Your ASIN was not yet set up in our system for these external IDs to map.
For more information, see the Name your image files Help topic.