Has anyone been able to replace the VFX Creator’s sprite textures, or even better, replace its Niagara System? I thought I remembered hearing that at least the sprites were replacable, but it doesn’t work for me. For me, UEFN allows me to add my own sprite textures to the Details, but they don’t show up in the editor or in Live Edit. When I try to replace the Niagara System in the Device’s outliner, the new system shows up in the editor but not Live Edit or gameplay. In the device settings in Live Edit, it shows my sprite setting as “Custom” but the actual sprites are just the default circle.
I understand I can use the VFX Spawner, but I want the Creator because I want to make custom player trails. 
I see custom sprites were brought up in Feedback by @AxelCapek in September but that was the last mention I see.
I also see this October post by @MattisRodrigue , who was able to replace the Niagara System in the VFX creator. MattisRodrigue, are you still able to replace the Niagara system for the VFX Creator, or has the feature been removed?