You need a Wikimedia Commons account and to have authorized OAuth Uploader for this tool to work.
Don't forget to go to the Commons image afterwards and add categories.

Mapillary 2 Commons 2

Street-level photos on Mapillary can be uploaded to Wikimedia Commons under the CC BY SA 4.0 license.
Enter an image key ('pKey') or Mapillary URL below and click "Lookup".

File to be named:

Uploading will send this information through the URL2Commons service (you don't have to click anything on the next page).