OK, so it is a problem in the mapillary app. @Anders already answered earlier on your post, so I guess he is looking for a solution already
I also use a Gopro, but never use the app. Basically because I don’t have space enough in my phone for another app, but also because I never thought it worked the way I want.
I track my GPS koordinates on my phone and then connect them to my photos with another program (geosetter) and use the webupploader.
You could also use pythonscripts, @tryl has a lot of experience with that.
But I never got it working on my computer
Anyway, there are a lot of other ways beside the app, to upload your photos