"Create Keyframes on" is not functioning effectively

Hi…I’m working with a cutout rig firstly.

After spacing and timing the keys I go to set them on 2s using the Create keyframes on Button. Then once i have selected the settings I click ok and get this prompt:

The 3d paths selected might change outside of the selected range dude to the nature of the interpolation" That is really hard to wrap my brain around.

The results cut off some of my drawing elements but when I check to see if they drawings have been deleted from the timeline, it shows that they are there…even in the drawing substitution panels.

Take a look at the screen grab if it helps.

Thanks so much for all your support.


NB - Related Tool has cut away the hand, eye and legs. As you can see, the hand is not deleted, and is showed in the drawing substitutions.