EMQX Plugin

Hello Team,
We have upgraded EMQX broker from4.3.5 to 5.0.21. in previous version we were have preloaded plugins but in upgraded EMQX 5.0.21 its missing. but we tried to install it using rebar template using emqx dashboard but we are getting network client error. Can you guys please Help us out how to add plugins in upgraded emqx broker