Edge notification and lock screen notifications

[The Gos]

Afternoon

I have the Samsung S8+ and this is my first samsung (have been an iphone user before)

I have edge lighting notification set up and when my screen is blank I a message my edge lights up and I see a notification at the top which is fine eventhough it is small.

However, on my iPhone my notification would come on the lock screen and i could view the message and swipe to go to it.

Any new messages would then build up on the lock screen.

What I am asking is can I have the edge lighting to come on and not display a notification but to show the notification in the lock screen instead?

I have turned edge lighting only to come on when my screen is on so now when the screen is off notifications come straight on the lock screen but I get no edge lighting.

Also why does the lock screen go dark after 2 seconds it doesn't even give me time to check what I have received.

Thanks and apologies for the long post.