Can't put pics taken by a Canon onto my iPhone 4S?

A couple of friends and I went on a vacation recently and took many pics with my friend's Canon EOS REBEL T2i. My friend uploaded all those pictures onto a cloud account so it can be shared and all of us could download it to keep as memories.
I personally want to put these pictures on my iPhone, but I can't seem to click and drag any pictures onto my iPhone(which is currently connected to my computer.) Any advice?
Please and thank you…

Add them into itunes then copy to your iphone.

I have a folder called "iPhone photos" with subfolders in it (i.e.albums).
When I synchronize my iPhone via iTunes, I just simply point to that folder and tell it to synch the whole folder.

Any new photos I want on my phone, I first copy to that folder, then synch via iTunes.

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