Copying used to work just fine until today. From my PC (Windows 7) I can see all the files in my phone using the USB, so it's being recognized. I've tried multiple cables, turned off my AV, tried different movie formats, restarted the PC, I can delete phone files from my PC, I can transfer pictures and other files from my PC to the phone. But it will not transfer MP4, MKV, AVI from my PC.
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