Product Thumbnail missing

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I am using Advanced Pre-Order APP, which allows the function of partial payment. During checkout the product thumbnails are featured, however the images are not feeding through and leave a blank thumbnail. When I view the checkout cart through the edit page, all the thumbnails show, however when I am testing the page the thumbnails are not visible. My developers have discussed this process with the APP developers and they say it is a Shopify issue. Can you kindly review this problem and fix it. It is essential, of course, that the thumbnails of all products are featured to buyers during checkout. I am due to launch the website on Sept 28 and I am running out of time. I look forward to your response and appreciate any assistance. Thank you, MT

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