I got my moto z play on 1st week of March 2017. And uploaded my first photo on March 12, 2017. Till March 31 2017 it was showing under google photo > settings > backup & sync > upload size ::
Original size : the space will not count if original size uploaded from this device till March 12, 2019.
But on April 1st Original option disabled from my photo.
Promotion was :::
- Free Google Photos storage for two years at original quality.