As Sarah pointed out, waiting and refreshing makes everything work nicely. The added token at the end is generated by Launchpad and returned to the launchpad-integration package in an X-Launchpad-Blob- Token header (James Westby explained this on IRC).
So it appears that Launchpad is generating a token for the uploaded blob and then pretending that the token doesn't exist, which is positively weird. -- Report A Bug Launchpad page missing for Rhythmbox https://bugs.launchpad.net/bugs/311690 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to launchpad-integration in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs