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Applying this file to eBay
Three steps. The file is already in eBay's own File Exchange
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Open File Exchange. In Seller Hub go to
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Upload the file exactly as downloaded. Do not open it in Excel and save
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This file revises your existing listings. It does not create new ones,
change your prices, or touch your stock levels. If you would rather test first,
delete all but one row and upload that.