Bitmask enum as interface function parameter?

Development Programming & Scripting UI
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1

Hi, I have an interface that I wish to expose a “GetSaveFlags” function to the caller to return certain save flags. However no matter what syntax I define the interface function, the enum parameter always gives me a single drop down item as if it was a regular enum.

Here is my enum declaration:

UENUM(BlueprintType, meta = (Bitflags, UseEnumValuesAsMaskValuesInEditor = "true"))
enum class ESavableFlags : uint8
{
    None = 0,
    SaveTransform = 1<<0,
    SaveTest = 1<<1,
};
ENUM_CLASS_FLAGS(ESavableFlags);

Here is my interface functions:

    UFUNCTION(BlueprintCallable, BlueprintNativeEvent)
    void GetSaveFlags(UPARAM(meta=(Bitmask, BitmaskEnum=ESavableFlags)) uint8& SaveFlags);

    UFUNCTION(BlueprintCallable, BlueprintNativeEvent)
    UPARAM(meta=(Bitmask, BitmaskEnum="ESavableFlags")) uint8 GetSaveFlagsTest();

I tried UPARAM on both the return value and an out parameter, neither worked. Tried uint8 as the type and ESavableMask, neither worked.

However, if I have a field with UPROPERTY(meta=(Bitmask, BitmaskEnum=ESavableFlags)) that seems to work as intended. Just doesn’t work with function parameters.

What am I missing?
Thanks for any help!