When I connect them via USB, I can't seem to access the files on the Oculus. I've tried different cables and ports, but nothing works. Maybe there's some kind of guide or software that can help.
Just one correction, it says to do it all via Android File Tranfer. Unfortunately it is no longer available, its support has stopped and it cannot be downloaded.
MacDroid is frequently recommended as an alternative, it seems that you can even transfer files via Wi-Fi.