2 images.
Attaching two images of Dioscorea Hamiltonii.

How do you say that it is Dioscorea hamiltonii and not any other species as most of the species look quite similar ?

A plate in the book Edible Wild Plants of The Himalayas by R L Dadhwar and R R Farnandez shows the capsules and they are similar to the plant under reference, As per this book this climber is right twining and the species is also right twining. But still I may be wrong and stand to be corrected.

Thanks, … Do you have more detailed images ?

You will have to wait for another few days. Hopefully I will be able to send more details.