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Maybe try this plugin?
This can convert AnimtedSprite's animation frames in an AnimationPlayer.

Link Preview Image GitHub - poohcom1/godot-animated-sprite-2-player: A Godot addon to convert animated sprite frames to animations in an animation player.

A Godot addon to convert animated sprite frames to animations in an animation player. - poohcom1/godot-animated-sprite-2-player

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GitHub (github.com)