How are TSharedPtr types used in blueprints?

If you get that error it means that the type can’t be used in blueprints since unreal engine doesn’t handle reflection for that type.
(say you made a custom struct that didn’t use USTRUCT(), you wouldn’t be able to mark it as a uproperty)

You will need to use something other than TSharedPointer
Maybe TSoftPointer<> would work? I think this can be a uproperty

TSoftObjectPtr<> can be.