I recently took a trip with a friend to California and she had sent me her photos so I placed them on my Google Drive and downloaded them on my Pixel phone so that the pictures can get uploaded to my Google Photos with the unlimited full-resolution backup. However, when I checked my Google Photos it my data has decreased from 9gb to 6gb, is this supposed to happen? Also, I was reading this article How the Google Pixel's unlimited photo and video backup works | Android Central and it says that pictures uploaded from the Pixel should say 0 bytes when you click the "i", however I can see how much byte each pictures are, for pictures I have taken using the Pixel camera, pictures I received and downloaded from Skype and Whatsapp. So I'm a little confused is it not unlimited anymore?