a week ago - last edited a week ago
Only photos and videos captured using your GoPro cameras (except Fusion) can be imported to Quik for Desktop. You can refer to this article for the ways and the step-by-step instructions on how to import media files to Quik for Desktop: https://gopro.com/help/articles/how_to/How-to-Import-Using-Quik-for-desktop
There are also some software suggestions in this article that will help.
If you would like product or tutorial videos to better understand these other applications, I recommend searching online video hosting websites (such as Youtube, Vimeo, etc) for published videos or other 3rd party generated content.