That's not the first frame, it's the fallback image that png decoders which are unaware of apng decode. It is never shown by compliant apng decoders. You can m

That's not the first frame, it's the fallback image that png decoders which are unaware of apng decode. It is never shown by compliant apng decoders. You can make it the first frame of the animation, or any other image you want. e.g. some text saying "APNG unsupported"