What is an effective way to pass plug-ins among teammates?

My two friends and I have been developing an unreal project together and has the files on a plastic server for source control. Recently I realized If I buy and install a system plug-in, my teammates will not be able to open engine when synced (because they don’t have the plug-in).

What’s the most effective to ensure all my teammates has the necessary plug-in files?

I’ve considered having our own standalone version of unreal but sometimes files for system plug-ins aren’t so easy to find. If this is the right way to do it, what is the best way to see what are all the files within a plug-in so I can carry it over to our standalone version?

Just move the plugin from the engine Plugins folder to the project Plugins folder and submit to source control.