my airline doesnt have such a policy that the pax should put it in the stowages themselves
i have never actually had a pax ask me to stow their bag for them, but i will offer my assistance if i think they won't be able to manage it (if they are very odl and frail or just very short!). but i always make sure they hand the bag to me so that i'm not bending my back. i'm sure when i've been flying for a few more years i will have rude people who expect me to stow something i cant even lift!! lol