First you’ll want to clean up your existing i OS 9-compatible device.
There are still things to do after you updating your device to i OS 8.
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Once you do that, you can launch the Music and Video apps to delete songs or videos one at a time with a swipe to the right.
You can add these files back to your new i Phone 6s if you like, but it’s like spring cleaning — stuff we don’t need clutters up our lives. I try to organize most of my apps into folders by topic.