For instance, use a vendor and invoice number to construct a URL, and have it available in a form of a button on a list view? Our model / template code is below
button of "ViewImage"
visible when (InvoiceImageEntered)
view first PayablesInvoiceDocumentInvoiceTypeRel.Attachment.File
display as link
Desired pseudo code would be
button of "SomethingElse"
visible always
view "">example.com
display as link