I am a citizen of India, currently doing my fellowship in United states on J1 visa. I need some more information regarding J1 visa stamping/ renewal in Canada with my valid Ds 2019 form. I had my previous J 1 stamping back in India in 2017 during my residency training which is a different program from the one I am doing currently doing my fellowship.
My questions are
1) Can I get my J1 visa renewal/stamping done in Canada. If yes, what is the process?
2)Since I have change in program or (employer) do I require an interview or only drop box?
3) How long does the process take?

Any help is appreciated.

Thanks in advance