I have the RG28XX connected to my PC with USB Connection set to MTP and it is not being detected. (I am running Linux, Pop!_OS) It also doesn’t get detected when connected C-to-C on my phone. Is there something I’m missing?
I’ve never been able to get MTP working over usb c to c, only a to c
i use usb c to c and working fine… for my problem, i reflash my sd card 
Hmm weird, I’ve never met another person able to transfer files over MTP with a USB c to c cable. I honestly thought it wasn’t possible
My PC have a type C port and i have a type c to c cable that i use with that…