Have you tried drag and drop on to your PC, then from your PC to the device?
So you're able to get your SD card data into your chromebook, but not from your chromebook to your Nexus 6?no pc , chromebook only, but ive dragged and droped to my lg g3 before
So you're able to get your SD card data into your chromebook, but not from your chromebook to your Nexus 6?
I'm not sure I understand where you are having an issue.