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moving keyframes over a few seconds, masks aren’t moving, too…?
So, I have a guy mowing the lawn. The cut grass is revealed as the mower mows by using masks. Now I want to add a few seconds before the mower starts mowing. I can select all the relevant keyframes and just slide them down to the right, but not the masks. I’m sure I’m thinking about this wrong, but I want very much to do them all at once and not have to reposition them individually afterwards. There are five masks total.

Thanks for your help.