I agree that it doesn't work near as well as on older models. My s3 did a perfect capture every time. My S7 has to be finessed and it always ends up clicking on something or swiping to next page. Very frustrating.
I had ads appearing in Stock text app, stock phone app, and on home screen, and I did as above w Google ads, and it worked. I am about to have to do it again tho. Annoyingly enough.