Help with pointing on a pic

hello there…
i have multiple objects in my class and each object has a type
let’s say type A , B ,C
each type i have a picture for it (A.png …etc)
i want to give each object this file in field called pic without repeating multiple files for the same type of objects ( two objects with type A point on one pic calle A.png ) i don’t wanna duplicate pics … so how can i do that … thanks

You can upload pictures yourself and associate the picture in before save trigger?