Sorry if some of this is blindingly obvious, i've been through a few tutorials but i can't figure a couple of basic things out.
Is it possible to add images in for a couple of frames half way through the animation timeline. or remove them. Say if i wanted to add a picture of PMG?
if you import it at the frame you want it to first show it will be automatically invisible up to that point - then just click the visibility track where you want it to become invisible again. (you may have to turn on 'allow editing in frames other than 0' or something similar in the options)