Hi! I want to have access to my phone files when connecting to my mac but when I go to USB preferences and choose for "usb controlled by:" -> "connected device" instead of "this device" it just says "couldn't switch". How can I fix this? Thanks

    Check in
    Setting > Security and Confidentiality > Exploit protection > USB-C port
    And select at least Chargin-only when unlocked.

    Keep your phone unlocked,

    Plug it yo you Mac

    Select files transfer on the phone and you are done.

    4 months later

    23up Are you using the 'Android file transfer' application? This seems to work for me.