I have a sequence of 77 images captured a few days ago which has not been uploaded yet. Today came a new release of the app (android app, version 3.50) and when I now try to upload the images it first says “upload in progress, processing sequence 1 of 1” and the counter rapidly goes from 1/77 to 77/77 (in a few seconds). I guess this is some sort of preparation process, I have noticed that this has been fast earlier too.
After that the real upload should start, but then it just says “upload finished”, but the images are still there (not removed) and when I log in to my account at mapillary.com there are no signs of any recent uploads.
Edit: I have the same problem with a brand new sequence. It says “upload finished” without uploading any images.