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Hi,
I have a precomp of 20 milliseconds, which I need to increase the duration to 20 seconds, however I need to move the keyframes proportionately with the composition duration.
Any advice?
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You can change the comp duration and then press U while not selecting any layers, select all your keyframes and alt + drag to the end of the comp.
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While this won't work in all contexts, dropping this composition into another one (so it's now a precomp) and then using either Time Stretch or Time Remapping can get you the desired effect.