how to re-add missing frames

I had some folks work on some of my toon boom scenes, I had them returned to me with missing frames in the time line. How do I re-add these frames back into the time line again.

I’m using Toon Boom Animate 2 on an Apple OSX

By the way, I should let you know that these frames are hand drawn (black line only) on paper and were imported and vectorized, then they were colored.

It’s hard to say what the problem is without taking a look at the file. Go ahead and email and they can take a look at it.