Greeks visited India, they saw. They remembered, they could easily have brought back items with designs. In India they wrote books on specially prepared leaves, tied together in sheafs with string, and with wood covers. They did that for thousands of years.
Sheesh.
I ask again - where is your primary source stating Greeks were studying Indian art and architecture before Alexander?
How was the Sanskrit translated into Greek anyway? That was not done until after Alexander.
No need to Sheesh - prove it to me - I am open to new facts.