Where does Google Drive store auto backed up photos?

I've set up photos and videos automatic backup on the Google Drive's iOS app following these instructions and I took a photo using my iPhone to test it.

After a while I could find the picture and open it on the "Recent" tab on the website. But I don't know where it is stored (the name of the folder). I also have Google Drive installed on my mac and I couldn't find it there either.

Does anyone know where can I find it?

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