Can't get ringtones onto new iPhone 6

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I got the new iPhone 6 on Friday (yay!). But... for some reason, I can't get my personalized ringtones off of iTunes and onto my phone. I was on the phone with tech support yesterday and they pretty much said it can't be done. But I don't really think he knew. Maybe it's wishful thinking on my part. But... I created my own ringtones. They are psychically on my computer and do show up under "Tones" in iTunes. They are m4r files that worked fine on my iPhone 4S. So... why can't I get them onto my new phone? Does anyone else have an issue with this? Any suggestions? Thanks so much.