A marketer is finalizing their video ad and wants to make sure the visual elements are enhanced for all surfaces automatically. Which feature should they use?

They should use asset optimization. Google's video surfaces vary — standard YouTube playback, Shorts, in-feed, connected TV — and each favours different framing, aspect ratios and durations. Asset optimisation adapts the creative automatically so a video is presented appropriately wherever it serves, instead of a single horizontal cut being letterboxed into a vertical, full-screen environment. The advertiser keeps control over the inputs and can review the results, so this is assistance rather than a loss of oversight. It also does not replace the value of supplying purpose-made assets: where budget allows, native vertical and square versions still perform best, and asset optimisation is what covers the gaps and the surfaces you did not explicitly prepare for.