.unrealengine.com/en-US/…ger/index.html
I don’t know why Unreal does not expose file operations to Blueprint, but might have reasons, eg. that Mods created with Blueprint are not able to damage the filesystem.
As of Unreal 4.23 Unreal has exposed SourceControl functionality to Blueprint. MAYBE that works for you. Not sure what a Copy File would actually do in case.