There is an option to save GoPro videos to Photos. Don't use this as it transcodes the footage (mp4 to mp4). Instead:
- Open video in GoPro app
- Click the three dots menu > info > captured on
- Share icon > Share > 3 dots > Save to files > GoPro
- Plug phone into PC
- Open iTunes > File Sharing > GoPro
- Drag and drop videos to the Blog Media day folder which matches the capture date. Small batches are better to get an idea of progress vs hanging.
- The iTunes window will show the + cursor until the copy operation is complete