In an Unearthed Arcana, there is a fighter archetype: Sharpshooter.
At level 18, they gain the following ability:
Starting at 18th level, if you take the Attack action on your first turn of a combat, you can make one additional ranged weapon attack as part of that action.
How does Snap Shot interact with the fighter's existing Extra Attack feature?
For example, at level 18, the fighter has Extra Attack (2); would my first Attack action look like:
normal attack + extra attack + extra attack + snap shot?
or is it:
normal attack + snap shot + extra attack + snap shot + extra attack + snap shot?