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I have cloned your form. Per your demands, I have tried to edit the cloned version. As far as I understand you want your form to look like this:
You can add text boxes like this with a file upload field. When you give them respective names you should be able to separate one from another when you add other fields like this for other products. Can you please give us further details if this is not what you are looking for? We can provide better assistance about this then.
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