Hello @reuf. Are your GoPro files recognized by your computer or by Quik for desktop when the SD card is directly inserted via SD card adapter? Have you tried using the cable from your HERO6 Black camera package to connect the HERO8 Black to your computer? By any chance, have you been able to use a different computer to access your HERO8 Black footage?
I have returned my camera as requested by Go Pro.. I worked with the Go Pro tech on the phone for several hours trying things on camera, card, cables and computer and we could not get camera or SD card with Go pro 8 footage to show up in QUICK. She suggested I return camera so I did.