Web browser Autofill question

[Jiggaman9j]

I kno how to turn autofill on and off in settings, but theres certain sites that use to autofill on my s6 that dont on the s8 and im not givin an option to do so. Id like to kno how to i can control this? Like make every site of my choosing do autofill...is there a way to bring up the option manually? So far it seems to randomly pop up on some sites and not others