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Is there a way in blender to view the last frame as an outline while on the current in adobe flash it's called onion skin this is useful so we can animate better and know where the last frame was instead of going back and fourth
When animating an armature you can use the ghost feature in the armature tab. The range value determines how many frames it will show at once.
And the result:
New result with your .blend:
Required, but never shown