Pasting Key Exposures Using Different Modes

As you animate, you will find that you reuse key exposures. There are different options to paste your selected drawings when they contain key exposures:

Enforce Key Exposure: If there are key exposures that exist on copied drawings, they are preserved when pasting. No key exposures are added. This is the default behavior when pasting.
Fill Gap with Previous Drawing: Fills selected area in the Xsheet or Timeline view with the previous drawing.
Fill to Next Key Exposure: Fills selected area till the next key exposure.