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APNG is an animated PNG format, but still uses the file extension .png for backwards compatibility. The example APNG from https://en.wikipedia.org/wiki/APNG This uploads without complaint, and ...
#1: Initial revision
Does APNG work in posts?
APNG is an animated PNG format, but still uses the file extension `.png` for backwards compatibility.  The example APNG from https://en.wikipedia.org/wiki/APNG This uploads without complaint, and displays in the editor preview and in the final rendered post with the animation working correctly.