Adding new frames at the beginning

hi

 

struggling hard no luck right now.

i had created couple of layers, som keyframes , som tweens , audio track (don't know if makes difference)
but wanted push created work number of frames ahead - far good, not issue
when did got number of empty frames - spanning beginning frame pushed existing frames...
i thought i'd have insert new keyframes on first , last frame in newly insterted span...
but when create first fram keyframe , insert content, same last... intermediate frames remain empty - i'd expect frames same after first keyframe until next keyframe change take place (had done changes in last keyframe of course)

 

what doing wrong here?

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