I have a trip to Ecuador which only requires vaccine proof and a Government form. It says to go to site, fill out the form and upload it. When I click "I already completed this form" there is no option to upload it. Beacuase of this it won't let me check in.

I can check in at the airport no problem, its just annoying. If they have to verify it at the airport like they always have with your passport before boarding , why not let u check in online?