I am trying to work how open cart 2.0 extensions work because in modules you have install button as well and there also found another part called extension installer I not sure what the purpose is.
If any one can explain why you can install modules in the module controller and also why there is extension install?
apart from filezilla upload your file
opencart 2.0 can using extension installer upload your .ocmod xml or zip plug-in directly
but need the fill the ftp information first in system>setting> ftp