I go to photos app.
I DO NOT select "Delete after import" (for the purpose of seeing if it mattered). I import photos from iphone.
Now I havent found an obvious way to go back and delete all of the just imported photos from my device.
If anyone has a way to do this that would be good.
If you do not want to deal with this, select "delete after import" when you are importing photos. This is for if you forget to do that.