HDRI background

Good day po mga masters,
I have been recently practicing HDRI lighting. In the middel of my study, it is adviced to press "alt + B" and check the "show background image box" to update the hdri image in the view port background. Long story short, hindi siya nag update; hindi makikita ang hdri sa view port background which is important for knowing where to put your sun or direct light. Please help. Thanks in advance po.

if you check the box for Show Background Image - you must load it. or if you have image on your environment, check the box for Use Environment Background Image instead.

first, press 8, then place the hdr imge sa environment slot
second, press alt+b
>tick the "use environment background" button
>tick display background