It appears that it's locked to the device you're using, so I would guess you're limited to "high quality". That's a real problem for, say, people taking photospheres, which generally clock in at around 40MP, and will be reduced to 2MP at "high quality".

Oh no, that's terrible. I really need to migrate, I guess. I was getting tired for paying for Google drive anyway. Onto someone elses family plan, I go.