I've tried everything, but only one thing proved to be the solution. The symptoms were: No Notification in my Phone for Connection, ONLY CHARGING FUNCTION WAS STILL ON. I have tried on several computers and with different cables, still was happening. The problem itself is in the Mobile phone. Go to 'Storage' --> 'Eject/ Unmount the SD Card', thereafter you must 'Mount' the SD card. You don't need to restart the phone or taking the SD card out of the device. I don't know what the SD card has to do with the Data transferring via USB port, but it really helped me. It's a Quick fix. Good luck!
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