Cannot paste files into System/Media I am looking to change my boot audio but cannot change it due it not copying from my computer to my phone but I can copy from the device to my computer.

I have the latest version of Android Studio / SDK
I have the latest version of Droid Explorer

I can view my files and copy from but can't paste to my device.

Please can someone help



Hello my device is rooted and has supersu and exposed framework and BusyBox 



Also I can make those changes if I copy to sd card and use es file explorer to paste them to system media folder.  Also before I installed busybox the folder contents of my device didn't display in Droid explorer it would connect but was a blank directory so that's been fixed but as for file permissions it hasn't as I have rooted it and given ADB root permissions etc but can only take files from the device in Droid explorer but can't paste them to the device
You need to root the device and give permission to copy files using any root explorer.