I found this page on Addictive Tips how to set default USB transfer type in Marshmallow:
http://www.addictivetips.com/android/how-to-set-the-default-usb-connection-type-in-android-6-0/
It would not let me change it to the USB Ethernet setting. But I was able to set it to MTP rather than PTP. Now when I plug it into my Windows Laptop it shows as a media player rather than just an MP3 player. In any case TeraCopy seems to have no issue with transfers at USB 2.0 speeds.
http://www.addictivetips.com/android/how-to-set-the-default-usb-connection-type-in-android-6-0/
It would not let me change it to the USB Ethernet setting. But I was able to set it to MTP rather than PTP. Now when I plug it into my Windows Laptop it shows as a media player rather than just an MP3 player. In any case TeraCopy seems to have no issue with transfers at USB 2.0 speeds.
















