If you have a Note 4 with the Marshmallow OS update, the default USB mode is now charge only. Once you connect the phone and computer with the USB cable, you'll need to pull down the phone's notification shade and change the USB mode to File Transfer, then you should be able to copy files from the phone to the computer.
I know how important it is to get your pictures backed up to your computer, SUNBURST492. To best assist you, please navigate to Settings > About Phone and let me know the Baseband version and Build number you see so that I can be sure you get the right steps for your specific device and operating system version.
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