Score the basket or on the floor?

[tomegun]

As the dribbler (A1) is going to the basket and begins his steps for a layup the ball comes into both hands. With the ball in both hands, A1 is fouled and takes his/her step(s) to complete the layup.

Is this basket good or is the foul on the floor?

What is the difference with continuation between NFHS, NCAA and the NBA?

This is a weakness among officials that I've heard several times this year during meetings (not my words, although I agree).

Speaking of step(s) to the basket, which foot is the pivot foot during a regular right-handed layup?

I have my own thoughts about this, I would like to see what others think.