"Dras Volcanics": are relicts of a "Late Cretaceous" to "Late Jurassic" volcanic island arc and consist of basalts, dacites, volcanoclastites, pillow lavas and minor radiolarian cherts

and

"Indus Suture Zone": represents the northern limit of the Himalaya. Further to the North is the so-called "Transhimalaya", or more locally "Ladakh Batholith", which corresponds essentially to an active margin of Andean type. Widespread volcanism in this volcanic arc was caused by the melting of the mantle at the base of the Tibetan bloc, triggered by the dehydration of the subducting Indian oceanic crust.

So yes, there were quite a lot of volcanoes just before the collision itself, when you still had an island arc due to the oceanic crust part of the Indian plate subducting below the continental crust to the north of it. Once that has been decapitated and dropped into the mantle, you had dry continental crust colliding with another chunk of dry continental crust. There is some melting here and there (leading to mostly plutonic rocks including the famous Himalayan leucogranites), but nothing serious.