I cannot help very much, directly, as I do not own a Hifi Rose product.
But seeing as you’ve had no replies in 3 days, I’ll try!
Some Hifi Rose products can only function as a uPNP Server - not as a uPNP Client.
Could this be the issue with your product?
Have you installed all updates? Perhaps the ability has now been added?
Some people appear to use Mconnect as some sort of workaround, to feed their Nas to the Rose.
This is all based only on my rudimentary understanding of the product, though!