To get best workflow of DJI Phantom 3/4 4K video with Davinci Resolve, the best way is encoding DJI Phantom 4K video to Davinci Resolve natively compatible editing codec like QuickTime, Prores or DNxHD codec.
Official Guide(More details here): http://www.pavtube.com/work-dji-phantom-4-4k-video-with-davinci-resolve.html
Pavtube Video Converter: http://www.pavtube.com/video_converter/
Pavtube Video Converter for Mac: http://www.pavtube.com/video-converter-mac/
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