Sorry to hear you faced this issue, there was a bug that our engineers worked on resolving, we will make sure this doesn't happen again.
damn if it's not happening again with yet another completely different model. I finally got my last models done after a few days of persistence when all of a sudden my models magically were able to upload leading me to believe its something on yalls end.
Same for me. Tried several browsers. Uploads seem incredibly slow, then get to 90% and I get the "Failed to Upload" error.
Customer support service by UserEcho