Invisible imp fireball / Decorate

[Curunir]

So, in short, I'm trying to grab just the Beautiful Doom fireball sprites and replace the normal imp fireball, without changing anything but the graphics / sprites.

I haven't touched anything Doom-related in around a decade when it comes to editing and I really have no idea what I'm doing wrong, but the fireball ingame is invisible, even though it does hit and do damage.

Any help would be appreciated. Here is what I have:

https://i.imgur.com/QI8cH8k.png

[Curunir]

Issue solved by using a pk3 and putting the sprites inside a SPRITES folder.