If you made a 4K video with Anafi, controlled with your S8, you can download the video to any device (S8 smartphone, PC, laptop, other phone like iPad, Mac ...).
There are 3 ways to do this:
- extracting the microSD from Anafi and reading your media with a cardreader or SD card slot in your PC
- connecting Anafi to your PC with a USB-A to USB-C cable: on your PC Anafi is an external drive
- over Wifi from Anafi to your S8
Did you mean this with your question?
A good video editor is Sony Vegas Pro.