How to transfer pictures from your PC to an iPhone 4?

I plugged in my iPhone 4 into my computer through a USB chord, and I opened up the folder with the pictures from my phone. I've tried dragging the photos from my computer into that folder, but it doesn't allow it.

So how do I transfer my photos onto my phone?

Plug it in, go to my documents, and right click on a picture then press save

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