Has anybody thought of using The DJI OSMO with Mapillary? I'd like to but can't see, to figure out how.
I guess you should use the uploader on the website or an upload script @tryl knows all about upload scripts.I don't know if the osmo has gps, otherwise you could use a free app on your phone to record a gpx-track
If you have the images you needs to geotag them. Either with your favorite GUI program or with the python scripts in https://github.com/mapillary/mapillary_tools/tree/master/python . Then you need to upload them, as @Harry described.
Basically it is the standard action cam workflow. Just ask any question here