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Hover the mouse over the Valuevalue of your Shape KeyShape Key and then press the II key to create the Keyframekeyframe for the Shape Key Valueshape key value.
Hover the mouse over the Value of your Shape Key and then press the I key to create the Keyframe for the Shape Key Value.
Hover the mouse over the value of your Shape Key and then press the I key to create the keyframe for the shape key value.