For those who want to use Google's Android File Transfer app for Mac, which for some reason isn't regularly available from Google anymore, it's still available by direct download: https://dl.google.com/dl/androidjumper/mtp/current/AndroidFi...
I also have a usb-c flash drive for copying as well.
Amazon has a great MTP app but it only works with Kindles.
Your mileage may vary.