If any of you guys get stuck in this state again (or are still stuck), please use "Report Bug" right after trying an upload, and then let us know if rebooting resolved it. We'll see if there's something fixable going on.
Anecdotally, I've seen Google Drive itself (i.e. in scenarios not involving Camect) getting occasionally stuck on uploads from a particular device in the past week. I don't know if there's a pattern there, but hopefully we can tell from the logs whether it's a problem in the code, or stuckiness in Google Drive itself.