Here are the steps to extract the DJI flight log file and convert it to a .GPX for GeoSetter.
Step 3: On gpsvisualizer.com change output format to GPX. Click the "Choose File" button to load your csv. Click "Convert" button. On page that opens, right click on the "following link" text and choose "Save link as..." to save the converted GPX.
Step 4: Follow the below video tutorial (starting at minute 4:06) about geo-tagging in GeoSetter using the GPX file.