Cannot name with nametag

I am using Asus Zenfone 5 (ASUS_T00F)

The "name" button did appears when I point to a mob while wielding nametag. But when I click the button, nothing happens.
Until now, I just failed to name horse, pig, and sheep. I haven't tried to name other mob.

I guess there's no picture needed for this issue since the issue is that nothing happens