How many times does bonus damage from proc in one round ?

Was told once by one dm , others were told on hit by another sooo Now im curious ...

So example...
you have 1D3 = pp Slot damage universal.
You also have Secondary attack , Free action attack , Basic attack , and bouns attack on crit

So lets say all hit do you do 1d3 bonus damage or do you do bonus 4d3 damage

In your example all would hit and proc +D3. Important to note you have 2 Free Actions in there and therefore could only do 3/4. And if that becomes an issue we will be rewording these bonuses actions/attacks.