I edited ApngPicture.js,
but it still doesn't work if either Encrypt assets or Source code protection is checked.
I unchecked Image compression.
I tried it in various other game projects too,
and when Encrypt assets or Source code protection is checked, it often doesn't function properly or the game won't launch.
If it's deployed and working with RPG Maker MV or MZ, I'd like it to continue working properly after packaging with Cook Tool Deluxe.
I look forward to future updates.