You can only apply for a visitor visa from inside Canada if you meet all of these criteria:

already are in Canada
hold a valid study or work permit
want to leave and return to Canada in the near future, and
have an existing visitor visa that’s expired, or is about to expire, or that was valid for only 1 entry @canadianstruggler
If you already left Canada and need to apply for a new visitor visa
You must follow the process to apply for a visa from outside Canada instead of the inside Canada process outlined below. There are different requirements you may need to meet since you’re outside Canada.

for more info please visit https://www.canada.ca/en/immigration...