I admit ignorance with this, so bear with me. I'm trying to transfer (and play) an mp3 file from my computer (PC Windows 10) into my Pixel, but when sending to Pixel I keep getting "device has either stopped or has been disconnected: which isn't the case with the USB cable I'm using on my unlocked device. I downloaded a USB Driver Transfer app to "extract" file from computer but it tells me to keep trying. And to check external source, which I assume is the computer. All i want to do is transfer and play a damn mp3 file on my Pixel. Why so many obstacles?