ability to upload multiple frames, not just the starting and ending frames

I would love to have the ability to upload multiple frames—not just the starting and ending frames. For example, uploading six frames placed along a camera path and having the AI interpolate between all of them while maintaining the exact architecture, materials, objects, and camera continuity. This would allow for much more accurate cinematic animations with fewer inconsistencies and artifacts. I would also like to have the output video longer than 8 sec, maybe 20sec. Thank You.
Manuel