You say you've exported using the 'Export to Scirra Arcade' option from the latest build r216?
Do you get any errors at all when trying to update?
If no errors, then maybe Tom will be able to help or shed some light on the reason.
Yes, i exported to scirra arcade with the latest build r216 and no, i did not get any errors. It looks less then 5 seconds to upload it to the scirra arcade which usually isn't the case.
https://www.scirra.com/arcade/other-games/test-project-2181 is the link to my game. It does not include the updates to the skill menu (when pressing e on your keyboard, I added it to count how many skill points you have deposited into a single skill and their names above the icons) or the new plants and wandering AI. for the gasparinisaura (green dinosaurs).