The Pinephone allows folder sharing from a destop PC if you want to restore the direct access to your phone which was possible before Android 5

For those who want to restore a feature similar to usb access to your Android phone which was killed by Google in newer Android phones. This can be solved with the Pinephone: https://forum.pine64.org/showthread.php?tid=18080 It requires some coding and there are several options available how to solve this with the Pinephone.