Acrobat Pro: 2026.001.21691 (64-bit):
Using Virtual Printer PSA API v4 based designed drivers, Choose Paper Source by PDF page size does not function as expected.

Preview indications within Acrobat's print dialog correctly choose PageMediaSize member within PageMediaSizeFeature of WorkflowPrintTicket, however during actual printing process, the same member(s) are not chosen.

Instead, driver preferences default page size selection is seen in the delivered WorkflowPrintTicket. Both can be observed within the OnPrintTicketValidationRequested() event. The PDL being generated is Postscript.

This occurs for single page PDFs, as well as those that are multipage with varying sizes. In either case all pages perfectly match sizes available within driver.

Happy to provide more technical detail and/or explicit work session