Did you try both ports?
Also whats important here is that you have a high quality 4k60 cable / adapter, if you have a cheap cable you might get stuck at 1080p60 due to limitaions.
Yea, I ordered this Adapter in Amazon
▶ Cable Matter USB to HDMI Adapter (USB-C to HDMI Adapter) Supporting 4K 60Hz and 60W Charging black
Also, I have already good HDMI Cable too
Btw, In that adapter's description, "Supporting 1080p120 or 1080p90" is not written
So I'm worried It won't support 120Hz or 90Hz
If some adapter supports 4K 60Hz, that adapter also supports 1080p90Hz in usual?
and If I have all that products can Rog phone get 90Hz or 120Hz when It's connected to capture card?
thank you for answer