Hello

There are two options for the GoPro:

1. the microphone adapter jack 3.5 mm
With this, however, you also need a housing where this part can be placed well.
A battery cover with an opening so that you can supply the adapter with power.
And don't forget, with this cover the GoPro is no longer waterproof.

2. the media mode, here you can connect an external mic directly. But the Mediamode
is an absolute (US) misconstruction. Why....
You slide the GoPro into the mode, then mount the Gopro on a tripod or gimbal,
The original fold-out parts of the GoPro are used for this. Now it comes: As soon as the
battery needs to be changed, you have to take everything apart, otherwise you cannot change the battery.
change the battery.

Media Mod best Moc can be connected additionally