as a benchmark, a lightly mechanized force, with support troops, of about 200,000 men will consume about 1,000 tons of supplies a day just standing still on defensive If the whole force marchs the requirements would double or triple. Go into offensive, it will double or triple again. That is just the supply the force will consume, not including the supply that must be consumed just to get the supplies there. This also does not include any heavy equipment replacement that would be needed once the fighting gets serious.
I doubt at the moment any military force really has the ability to airlift 3,000-6,000 tons by air over any significant distance every day, day in and day out, to support 200,000 men on sustained mechanized offensive against opposition, even without the enemy contesting air superiority over the force.
There is zero possibility that the Indian military can conduct offensive operation inside Tibet with 200,000 men even if it were the most proficient or skilled force in the world.