You can use Meenova Dash Micro for Android. I use it with my Nexus 6 32 Gb. I bought a 128Gb class 10 micro sdxc card and use it with Nexus 6. Marshmallow recognizes the usb device and asks you under the notification whether you would use it as a part of the hard drive or only as a media storage. Depending on how you want to use you can format it and you can explore , copy/paste files etc. I love the device. The device is only $13 and 128 Gb micro sdxc card class 10 you can get for 50 to 60 dollars. Here is the link: Dash Micro by Meenova, the all new Mini MicroSD Reader.
That reader is Micro USB which is not going to work with the USB C port.