Problems adding products to Facebook catalogue

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Hi all, Ive been trying to connect my Shopify store to Facebook.  I'm at the point (after going round in circles) where I'm trying to connect them by using Flexify. Two or more of my products have errors in the data feed which need fixing before the product collection will upload to the FB catalogue, which seem to be about the URL link.   My question is how do you modify a product's inventory file to fix the issues? Thanks in advance, Mark.

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