Hi @Trygaios Adobe's model for creating content with Firefly is to deduct credits regardless of whether the output is deemed useful or not. So, you can end up using up a lot of credits tying to get something you're after, going multiple generations.
A limitation of Firefly (image and video) at this time is that you can't get a new version of the output with only slight changes to a previous one. With you video exampl of wanting just the last 2 secondso be changed, that would not be possible. Your only option would be to include the first frame as an image reference. That may get you the same look and feel and start but the full 5 seconds would be recreated.
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