Already have a visitor visa, do I still need to apply for one with study permit?

[Tenianu]

Hi I have a visitor visa to Canada from last year, and it is still valid for the next couple of years.
I am about to submit my study permit application and noticed that there is an optional document 'IMM5257e Application for TRV' within the upload list. My assumption is that I don't have to upload this document since I already have one and it will let me travel to Canada with no issue. Am I righting thinking this way? What will happen if I uploaded this form, will my existing visa get revoked and receive a new one with shorter expiry date on it?

Thanks for your info.

Once your permit is approved. You will be issued another visa on your passport Student travel visa ,the old visitor visa remains and is not cancelled.All the best in your application