HP ENVY Photo 6230 All-in-One Printer (Perivale UB6)

It claims to be out of paper, even though there’s paper loaded. I imagine it’s a simple fix for someone with the right know-how, but I haven’t been able to resolve it. Other than that, it's in good working order (please note, there are a few marks on it as per the photo). Spec: https://www.hp.com/ie-en/products/printers/product-details/16483173HP