How the fuck does the Poke-puff thing work for affection? Every mon I feed just looks pissed off at me and doesnt seem to even eat it, except charizard once. All I can do is spam snuggle them for affection and my highest is my sylveon at 2 hearts. How the fuck does this work pls. Also why is the camera so bad at picking things up most of the time

Pic related its my mons face when pokepuffs