Hi there. In response to your question it is highly recommended to hold the marksheets of your college in physical mode. If the university hasn't provided with any physical copy, the candidate should try to see two things. Firstly ensure that the digital copy mentions that it is as good as the original copies and secondly all universities have a n application form system where you can request them to provide a physical copy of your marksheets, provided you submit them proper details and reasons. Fulfillment of both of these pointers will then cause no obstacles in your interview.

Hope this answer helps; best wishes