Hello! Do the effects always have that outline or was that just part of the GIF?
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Hey! Yes, VFX files have an outline because they're designed to work with the other assets in the bundle. On the other hand , raw FX don't have one and are designed to recreate all sorts of effects from scratch.
I could consider versions without borders, but in the meantime you could probably remove them manually (Aseprite makes this quite easy).