Can't copy and paste pics from camera and iPhone 6 within same album to get in right order.

Trying to copy and paste pics in iPhoto album. The album contains pics from a camera as well as my iPhone 6. When I try to click and drag the pics so that they are in chronological order, the pics don't move. When I try to copy and paste, the pic won't paste to the correct location. It pastes at the end of the album instead. How do I move the picture to where I want it? Using MacBook Pro with OS X version 10.8.5