Photos deleted from OnePlus Gallery aren't deleted from Google Photos?

I just got a OnePlus 8T. I've signed into the same Google account. But when I delete a photo with the OnePlus Gallery app (v4.0.297), the photo isn't deleted from Google Photos? I'm new to Google Photos, maybe there's some setting I've missed. Is there a way to make Google Photos delete a file if I delete it from the OnePlus Gallery?

If I'm taking a lot of selfies, I take a lot, and then delete the bad ones, and the OnePlus Gallery is nice for that. So I want to keep using that.