See above – I believe that there’s a 300 second timeout involved here. So for the 950 MB sequence a sustained upload rate of 3.2MB/s is necessary to have a successful upload.
The timeout seems to happen for every sequence separately. In your case the upload process should stop after exactly 10 minutes.
My current approach is to keep the sequences small. In my case sequences of up to 100 images usually can be uploaded (upload rate ~1.2-1.4MB/s)
Holy shit - just noticed that many, many sequences (100+?) back to February now all locked - display MB, rather than images - probably gigabytes of Mapillary images that can’t be viewed, edited, saved, deleted or specifically uploaded - and taking valuable device space! Seriously pissed!
The EXIF is added during capture, it wasn’t before though. So there is normally no need to tap this button.
That button is only needed when capturing with an external camera, like a GoPro. And I label it as a bug that it also converts to the internal format, it’s on my TODO list to fix that.