Outputs file metafield on Shopify Storefront for PDF Files (Download link)

<a href="{{ product.metafields.custom.file.value.url | file_tag }}" target="new"> Download Rear End Order Form</a>

// for product.metafields.custom.file.value.url input your namespace.key so product.metafields.namespace.key.value.url

// edit "Download Rear End Order Form" as needed for your theme