Demand starts when the foreign exchange gets converted to rupees by exchange of goods or services in the local market.
For eg if i invest in India from the usa but source a large part of my equipment from usa , the rupee is unaffected , as equivalent part of the FE again leaves the country.
But if i set up a building or shed in india , which requires locally procured cement , labour and steel , the demand for inr occurs.
The diamond industry boasts a lot about 30 b usd of exports from India of finished diamonds but if you look closely, the net is a few billions as they import 95 % of the raw diamonds in value . Value addition is hardly 10 %.