I didn’t see it mentioned around here, they’ve released a GUI desktop uploader tool.
we’re now releasing the Mapillary Desktop Uploader, which is a desktop application that lets you conveniently upload large amounts of geotagged imagery to Mapillary. That includes organization imagery (both private and public), in case you are contributing on behalf of an organization.
The Desktop Uploader can handle much larger image quantities than the web uploader, is able to prevent your computer from going to sleep in the middle of the upload process (e.g. if you want to leave 25,000 images uploading overnight), and can pick up where things were left off in case something interrupts the upload—whether it’s a connection issue or you just need to pause it for some reason.