Gamenative and Gog. Black screen...

Hi. I just discovered GameNative and connected it to Steam, GoG, and Epic. I tried installing a couple of GoG games (Ultimate 5 and Absolute Drift), but both gave me the same problem: a black screen, but the cursor changed shape when I hovered over a certain area slightly to the left. I searched a bit, but couldn't find a solution. My smartphone is a Samsung S23 Ultra. Any suggestions? Thanks.