Same issue here been finding a solution for a month now nothing happens , after update to android 10 beta 2, usb preference greyed out tried to change it to transfer file on developer option still nothing happens, factory reset downgrade to android 9 still the issue remains this is the biggest pain in the ass bug ever I know that there are risk for trying beta updates but WTF asus why this? how can we fix our devices if we can't connect it to our PC's?